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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
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<PAGE> PAGE 19
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<PAGE> PAGE 20
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<PAGE> PAGE 21
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070 H020400 N
070 I010400 N
070 I020400 N
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070 J020400 N
070 K010400 N
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070 L010400 N
070 L020400 N
070 M010400 N
070 M020400 N
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070 O010400 N
070 O020400 N
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070 R020400 N
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<PAGE> PAGE 22
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<PAGE> PAGE 23
028 A040500 1143
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<PAGE> PAGE 24
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050 000500 N
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<PAGE> PAGE 25
063 B000500 23.2
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070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 N
070 K020500 N
070 L010500 N
070 L020500 N
070 M010500 N
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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<PAGE> PAGE 30
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<PAGE> PAGE 31
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<PAGE> PAGE 32
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<PAGE> PAGE 33
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<PAGE> PAGE 34
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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<PAGE> PAGE 37
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<PAGE> PAGE 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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062 F000900 0.0
062 G000900 0.0
062 H000900 0.0
062 I000900 0.0
062 J000900 0.0
062 K000900 0.0
062 L000900 1.7
062 M000900 0.0
062 N000900 0.0
<PAGE> PAGE 42
062 O000900 97.7
062 P000900 0.0
062 Q000900 0.0
062 R000900 0.0
063 A000900 0
063 B000900 18.9
064 A000900 Y
064 B000900 N
070 A010900 Y
070 A020900 N
070 B010900 N
070 B020900 N
070 C010900 N
070 C020900 N
070 D010900 N
070 D020900 N
070 E010900 N
070 E020900 N
070 F010900 N
070 F020900 N
070 G010900 N
070 G020900 N
070 H010900 N
070 H020900 N
070 I010900 N
070 I020900 N
070 J010900 Y
070 J020900 Y
070 K010900 N
070 K020900 N
070 L010900 N
070 L020900 N
070 M010900 N
070 M020900 N
070 N010900 N
070 N020900 N
070 O010900 N
070 O020900 N
070 P010900 Y
070 P020900 N
070 Q010900 N
070 Q020900 N
070 R010900 N
070 R020900 N
071 A000900 1972
071 B000900 4980
071 C000900 49402
071 D000900 4
072 A000900 12
072 B000900 3017
072 C000900 0
<PAGE> PAGE 43
072 D000900 0
072 E000900 0
072 F000900 255
072 G000900 0
072 H000900 0
072 I000900 71
072 J000900 13
072 K000900 6
072 L000900 13
072 M000900 6
072 N000900 1
072 O000900 1
072 P000900 0
072 Q000900 0
072 R000900 30
072 S000900 9
072 T000900 50
072 U000900 0
072 V000900 5
072 W000900 4
072 X000900 464
072 Y000900 0
072 Z000900 2553
072AA000900 252
072BB000900 1547
072CC010900 2352
072CC020900 0
072DD010900 2543
072DD020900 10
072EE000900 0
073 A010900 0.3675
073 A020900 0.3008
073 B000900 0.0000
073 C000900 0.0000
074 A000900 130
074 B000900 0
074 C000900 300
074 D000900 48877
074 E000900 0
074 F000900 0
074 G000900 0
074 H000900 0
074 I000900 0
074 J000900 5
074 K000900 7
074 L000900 910
074 M000900 1
074 N000900 50230
074 O000900 0
074 P000900 21
074 Q000900 0
<PAGE> PAGE 44
074 R010900 0
074 R020900 0
074 R030900 0
074 R040900 191
074 S000900 0
074 T000900 50018
074 U010900 6707
074 U020900 32
074 V010900 7.42
074 V020900 7.42
074 W000900 0.0000
074 X000900 1405
074 Y000900 0
075 A000900 0
075 B000900 51075
076 000900 0.00
028 A011000 34
028 A021000 75
028 A031000 0
028 A041000 423
028 B011000 99
028 B021000 106
028 B031000 0
028 B041000 726
028 C011000 214
028 C021000 102
028 C031000 0
028 C041000 131
028 D011000 189
028 D021000 102
028 D031000 0
028 D041000 541
028 E011000 74
028 E021000 103
028 E031000 0
028 E041000 814
028 F011000 376
028 F021000 102
028 F031000 0
028 F041000 254
028 G011000 986
028 G021000 590
028 G031000 0
028 G041000 2889
028 H001000 510
029 001000 Y
030 A001000 41
030 B001000 4.75
030 C001000 0.00
031 A001000 5
031 B001000 0
<PAGE> PAGE 45
032 001000 35
033 001000 1
034 001000 Y
035 001000 0
036 A001000 N
036 B001000 0
042 A001000 0
042 B001000 0
042 C001000 0
042 D001000 100
042 E001000 0
042 F001000 0
042 G001000 0
042 H001000 0
043 001000 53
044 001000 0
045 001000 Y
046 001000 N
047 001000 Y
048 001000 0.500
048 A011000 0
048 A021000 0.000
048 B011000 0
048 B021000 0.000
048 C011000 0
048 C021000 0.000
048 D011000 0
048 D021000 0.000
048 E011000 0
048 E021000 0.000
048 F011000 0
048 F021000 0.000
048 G011000 0
048 G021000 0.000
048 H011000 0
048 H021000 0.000
048 I011000 0
048 I021000 0.000
048 J011000 0
048 J021000 0.000
048 K011000 0
048 K021000 0.000
049 001000 N
050 001000 N
051 001000 N
052 001000 N
053 A001000 N
055 A001000 Y
055 B001000 N
056 001000 Y
057 001000 N
<PAGE> PAGE 46
062 A001000 Y
062 B001000 0.0
062 C001000 0.0
062 D001000 0.0
062 E001000 1.9
062 F001000 0.0
062 G001000 0.0
062 H001000 0.0
062 I001000 0.0
062 J001000 0.0
062 K001000 0.0
062 L001000 2.2
062 M001000 0.0
062 N001000 0.0
062 O001000 95.9
062 P001000 0.0
062 Q001000 0.0
062 R001000 0.0
063 A001000 0
063 B001000 18.2
064 A001000 Y
064 B001000 N
070 A011000 Y
070 A021000 N
070 B011000 N
070 B021000 N
070 C011000 N
070 C021000 N
070 D011000 N
070 D021000 N
070 E011000 N
070 E021000 N
070 F011000 N
070 F021000 N
070 G011000 N
070 G021000 N
070 H011000 N
070 H021000 N
070 I011000 N
070 I021000 N
070 J011000 Y
070 J021000 N
070 K011000 N
070 K021000 N
070 L011000 N
070 L021000 N
070 M011000 N
070 M021000 N
070 N011000 N
070 N021000 N
070 O011000 N
<PAGE> PAGE 47
070 O021000 N
070 P011000 Y
070 P021000 N
070 Q011000 N
070 Q021000 N
070 R011000 N
070 R021000 N
071 A001000 4457
071 B001000 3283
071 C001000 50815
071 D001000 6
072 A001000 12
072 B001000 3057
072 C001000 0
072 D001000 0
072 E001000 0
072 F001000 263
072 G001000 0
072 H001000 0
072 I001000 70
072 J001000 12
072 K001000 6
072 L001000 16
072 M001000 6
072 N001000 3
072 O001000 1
072 P001000 0
072 Q001000 0
072 R001000 30
072 S001000 6
072 T001000 53
072 U001000 0
072 V001000 5
072 W001000 3
072 X001000 474
072 Y001000 0
072 Z001000 2583
072AA001000 390
072BB001000 0
072CC011000 900
072CC021000 0
072DD011000 2564
072DD021000 19
072EE001000 548
073 A011000 0.3787
073 A021000 0.3093
073 B001000 0.0840
073 C001000 0.0000
074 A001000 78
074 B001000 0
074 C001000 1000
<PAGE> PAGE 48
074 D001000 51069
074 E001000 0
074 F001000 0
074 G001000 0
074 H001000 0
074 I001000 0
074 J001000 0
074 K001000 7
074 L001000 1276
074 M001000 2
074 N001000 53432
074 O001000 0
074 P001000 22
074 Q001000 0
074 R011000 0
074 R021000 0
074 R031000 0
074 R041000 170
074 S001000 0
074 T001000 53240
074 U011000 6749
074 U021000 61
074 V011000 7.82
074 V021000 7.82
074 W001000 0.0000
074 X001000 1419
074 Y001000 0
075 A001000 0
075 B001000 52612
076 001000 0.00
028 A011100 465
028 A021100 145
028 A031100 0
028 A041100 923
028 B011100 121
028 B021100 146
028 B031100 0
028 B041100 520
028 C011100 188
028 C021100 142
028 C031100 0
028 C041100 352
028 D011100 207
028 D021100 140
028 D031100 0
028 D041100 444
028 E011100 192
028 E021100 144
028 E031100 0
028 E041100 524
028 F011100 295
<PAGE> PAGE 49
028 F021100 141
028 F031100 0
028 F041100 482
028 G011100 1468
028 G021100 858
028 G031100 0
028 G041100 3245
028 H001100 997
029 001100 Y
030 A001100 85
030 B001100 4.75
030 C001100 0.00
031 A001100 10
031 B001100 0
032 001100 75
033 001100 0
034 001100 Y
035 001100 0
036 A001100 N
036 B001100 0
042 A001100 0
042 B001100 0
042 C001100 0
042 D001100 100
042 E001100 0
042 F001100 0
042 G001100 0
042 H001100 0
043 001100 69
044 001100 0
045 001100 Y
046 001100 N
047 001100 Y
048 001100 0.500
048 A011100 0
048 A021100 0.000
048 B011100 0
048 B021100 0.000
048 C011100 0
048 C021100 0.000
048 D011100 0
048 D021100 0.000
048 E011100 0
048 E021100 0.000
048 F011100 0
048 F021100 0.000
048 G011100 0
048 G021100 0.000
048 H011100 0
048 H021100 0.000
048 I011100 0
<PAGE> PAGE 50
048 I021100 0.000
048 J011100 0
048 J021100 0.000
048 K011100 0
048 K021100 0.000
049 001100 N
050 001100 N
051 001100 N
052 001100 N
053 A001100 N
055 A001100 Y
055 B001100 N
056 001100 Y
057 001100 N
062 A001100 Y
062 B001100 0.0
062 C001100 0.0
062 D001100 0.0
062 E001100 0.1
062 F001100 0.0
062 G001100 0.0
062 H001100 0.0
062 I001100 0.0
062 J001100 0.0
062 K001100 0.0
062 L001100 2.1
062 M001100 0.0
062 N001100 0.0
062 O001100 97.8
062 P001100 0.0
062 Q001100 0.0
062 R001100 0.0
063 A001100 0
063 B001100 19.2
064 A001100 Y
064 B001100 N
070 A011100 Y
070 A021100 N
070 B011100 N
070 B021100 N
070 C011100 N
070 C021100 N
070 D011100 N
070 D021100 N
070 E011100 N
070 E021100 N
070 F011100 N
070 F021100 N
070 G011100 N
070 G021100 N
070 H011100 N
<PAGE> PAGE 51
070 H021100 N
070 I011100 N
070 I021100 N
070 J011100 Y
070 J021100 N
070 K011100 N
070 K021100 N
070 L011100 N
070 L021100 N
070 M011100 N
070 M021100 N
070 N011100 N
070 N021100 N
070 O011100 N
070 O021100 N
070 P011100 Y
070 P021100 N
070 Q011100 N
070 Q021100 N
070 R011100 N
070 R021100 N
071 A001100 10855
071 B001100 15713
071 C001100 55791
071 D001100 19
072 A001100 12
072 B001100 3297
072 C001100 0
072 D001100 0
072 E001100 0
072 F001100 285
072 G001100 0
072 H001100 0
072 I001100 78
072 J001100 18
072 K001100 6
072 L001100 14
072 M001100 6
072 N001100 1
072 O001100 1
072 P001100 0
072 Q001100 0
072 R001100 30
072 S001100 7
072 T001100 69
072 U001100 0
072 V001100 6
072 W001100 4
072 X001100 525
072 Y001100 0
072 Z001100 2772
<PAGE> PAGE 52
072AA001100 757
072BB001100 9
072CC011100 1208
072CC021100 0
072DD011100 2713
072DD021100 59
072EE001100 313
073 A011100 0.3761
073 A021100 0.3063
073 B001100 0.0410
073 C001100 0.0000
074 A001100 285
074 B001100 0
074 C001100 100
074 D001100 55644
074 E001100 0
074 F001100 0
074 G001100 0
074 H001100 0
074 I001100 0
074 J001100 81
074 K001100 8
074 L001100 979
074 M001100 2
074 N001100 57099
074 O001100 0
074 P001100 24
074 Q001100 0
074 R011100 0
074 R021100 0
074 R031100 0
074 R041100 158
074 S001100 0
074 T001100 56917
074 U011100 7016
074 U021100 213
074 V011100 7.87
074 V021100 7.87
074 W001100 0.0000
074 X001100 1608
074 Y001100 0
075 A001100 0
075 B001100 57119
076 001100 0.00
028 A011300 382
028 A021300 142
028 A031300 0
028 A041300 1067
028 B011300 75
028 B021300 140
028 B031300 0
<PAGE> PAGE 53
028 B041300 534
028 C011300 176
028 C021300 136
028 C031300 0
028 C041300 535
028 D011300 1614
028 D021300 132
028 D031300 0
028 D041300 797
028 E011300 1364
028 E021300 141
028 E031300 0
028 E041300 919
028 F011300 269
028 F021300 132
028 F031300 0
028 F041300 529
028 G011300 3880
028 G021300 823
028 G031300 0
028 G041300 4381
028 H001300 727
029 001300 Y
030 A001300 65
030 B001300 4.75
030 C001300 0.00
031 A001300 8
031 B001300 0
032 001300 57
033 001300 0
034 001300 Y
035 001300 6
036 A001300 N
036 B001300 0
042 A001300 0
042 B001300 0
042 C001300 0
042 D001300 100
042 E001300 0
042 F001300 0
042 G001300 0
042 H001300 0
043 001300 72
044 001300 0
045 001300 Y
046 001300 N
047 001300 Y
048 001300 0.500
048 A011300 0
048 A021300 0.000
048 B011300 0
<PAGE> PAGE 54
048 B021300 0.000
048 C011300 0
048 C021300 0.000
048 D011300 0
048 D021300 0.000
048 E011300 0
048 E021300 0.000
048 F011300 0
048 F021300 0.000
048 G011300 0
048 G021300 0.000
048 H011300 0
048 H021300 0.000
048 I011300 0
048 I021300 0.000
048 J011300 0
048 J021300 0.000
048 K011300 0
048 K021300 0.000
049 001300 N
050 001300 N
051 001300 N
052 001300 N
053 A001300 N
055 A001300 Y
055 B001300 N
056 001300 Y
057 001300 N
062 A001300 Y
062 B001300 0.0
062 C001300 0.0
062 D001300 0.0
062 E001300 1.9
062 F001300 0.0
062 G001300 0.0
062 H001300 0.0
062 I001300 0.0
062 J001300 0.0
062 K001300 0.0
062 L001300 1.6
062 M001300 0.0
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062 O001300 96.5
062 P001300 0.0
062 Q001300 0.0
062 R001300 0.0
063 A001300 0
063 B001300 20.2
064 A001300 Y
064 B001300 N
070 A011300 Y
<PAGE> PAGE 55
070 A021300 N
070 B011300 N
070 B021300 N
070 C011300 N
070 C021300 N
070 D011300 N
070 D021300 N
070 E011300 N
070 E021300 N
070 F011300 N
070 F021300 N
070 G011300 N
070 G021300 N
070 H011300 N
070 H021300 N
070 I011300 N
070 I021300 N
070 J011300 Y
070 J021300 N
070 K011300 N
070 K021300 N
070 L011300 N
070 L021300 N
070 M011300 N
070 M021300 N
070 N011300 N
070 N021300 N
070 O011300 N
070 O021300 N
070 P011300 Y
070 P021300 N
070 Q011300 N
070 Q021300 N
070 R011300 N
070 R021300 N
071 A001300 6297
071 B001300 7704
071 C001300 51297
071 D001300 12
072 A001300 12
072 B001300 2983
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072 J001300 15
072 K001300 4
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<PAGE> PAGE 56
072 M001300 6
072 N001300 2
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072 S001300 4
072 T001300 72
072 U001300 0
072 V001300 5
072 W001300 4
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072 Z001300 2497
072AA001300 190
072BB001300 72
072CC011300 1648
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072DD011300 2406
072DD021300 91
072EE001300 187
073 A011300 0.3828
073 A021300 0.3118
073 B001300 0.0280
073 C001300 0.0000
074 A001300 105
074 B001300 0
074 C001300 1000
074 D001300 51418
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074 L001300 904
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074 O001300 0
074 P001300 23
074 Q001300 0
074 R011300 0
074 R021300 0
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074 R041300 158
074 S001300 0
074 T001300 53254
074 U011300 6236
074 U021300 325
074 V011300 8.12
<PAGE> PAGE 57
074 V021300 8.13
074 W001300 0.0000
074 X001300 1150
074 Y001300 0
075 A001300 0
075 B001300 52347
076 001300 0.00
028 A011500 393
028 A021500 266
028 A031500 0
028 A041500 1734
028 B011500 699
028 B021500 262
028 B031500 0
028 B041500 1000
028 C011500 616
028 C021500 253
028 C031500 0
028 C041500 1948
028 D011500 413
028 D021500 250
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028 D041500 1134
028 E011500 507
028 E021500 255
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028 E041500 1526
028 F011500 580
028 F021500 255
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028 F041500 1159
028 G011500 3208
028 G021500 1541
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028 G041500 8501
028 H001500 1932
029 001500 Y
030 A001500 151
030 B001500 4.75
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031 B001500 0
032 001500 130
033 001500 3
034 001500 Y
035 001500 1
036 A001500 N
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<PAGE> PAGE 58
042 D001500 100
042 E001500 0
042 F001500 0
042 G001500 0
042 H001500 0
043 001500 134
044 001500 0
045 001500 Y
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047 001500 Y
048 001500 0.500
048 A011500 0
048 A021500 0.000
048 B011500 0
048 B021500 0.000
048 C011500 0
048 C021500 0.000
048 D011500 0
048 D021500 0.000
048 E011500 0
048 E021500 0.000
048 F011500 0
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048 H011500 0
048 H021500 0.000
048 I011500 0
048 I021500 0.000
048 J011500 0
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048 K011500 0
048 K021500 0.000
049 001500 N
050 001500 N
051 001500 N
052 001500 N
053 A001500 N
055 A001500 Y
055 B001500 N
056 001500 Y
057 001500 N
062 A001500 Y
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062 E001500 1.1
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<PAGE> PAGE 59
062 J001500 0.0
062 K001500 0.0
062 L001500 1.4
062 M001500 0.0
062 N001500 0.0
062 O001500 97.5
062 P001500 0.0
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062 R001500 0.0
063 A001500 0
063 B001500 18.3
064 A001500 Y
064 B001500 N
070 A011500 Y
070 A021500 N
070 B011500 N
070 B021500 N
070 C011500 N
070 C021500 N
070 D011500 N
070 D021500 N
070 E011500 N
070 E021500 N
070 F011500 N
070 F021500 N
070 G011500 N
070 G021500 N
070 H011500 N
070 H021500 N
070 I011500 N
070 I021500 N
070 J011500 Y
070 J021500 N
070 K011500 N
070 K021500 N
070 L011500 N
070 L021500 N
070 M011500 N
070 M021500 N
070 N011500 N
070 N021500 N
070 O011500 N
070 O021500 N
070 P011500 Y
070 P021500 N
070 Q011500 N
070 Q021500 N
070 R011500 N
070 R021500 N
071 A001500 0
071 B001500 9537
<PAGE> PAGE 60
071 C001500 105700
071 D001500 0
072 A001500 12
072 B001500 6298
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072 D001500 0
072 E001500 0
072 F001500 535
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072 H001500 0
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072 J001500 37
072 K001500 8
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072 M001500 6
072 N001500 2
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072 R001500 30
072 S001500 4
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072 V001500 9
072 W001500 6
072 X001500 927
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072EE001500 1710
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074 A001500 102
074 B001500 0
074 C001500 1200
074 D001500 102062
074 E001500 0
074 F001500 0
074 G001500 0
074 H001500 0
074 I001500 0
074 J001500 0
074 K001500 15
074 L001500 1695
<PAGE> PAGE 61
074 M001500 3
074 N001500 105077
074 O001500 0
074 P001500 43
074 Q001500 0
074 R011500 0
074 R021500 0
074 R031500 0
074 R041500 353
074 S001500 0
074 T001500 104681
074 U011500 12375
074 U021500 449
074 V011500 8.16
074 V021500 8.16
074 W001500 0.0000
074 X001500 2216
074 Y001500 0
075 A001500 0
075 B001500 107271
076 001500 0.00
030 A001800 0
030 B001800 0.00
030 C001800 0.00
SIGNATURE THOMAS G. ROSE
TITLE TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>011
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NATIONAL CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 92748
<INVESTMENTS-AT-VALUE> 97942
<RECEIVABLES> 1544
<ASSETS-OTHER> 645
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 100131
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 371
<TOTAL-LIABILITIES> 371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 97501
<SHARES-COMMON-STOCK> 12169<F1>
<SHARES-COMMON-PRIOR> 12821<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2935)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5194
<NET-ASSETS> 97481<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5720<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (813)<F1>
<NET-INVESTMENT-INCOME> 4907<F1>
<REALIZED-GAINS-CURRENT> 278
<APPREC-INCREASE-CURRENT> 3753
<NET-CHANGE-FROM-OPS> 9106
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4907)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1074<F1>
<NUMBER-OF-SHARES-REDEEMED> (2069)<F1>
<SHARES-REINVESTED> 343<F1>
<NET-CHANGE-IN-ASSETS> (3833)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (3213)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 486<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 813<F1>
<AVERAGE-NET-ASSETS> 97236<F1>
<PER-SHARE-NAV-BEGIN> 7.70<F1>
<PER-SHARE-NII> .39<F1>
<PER-SHARE-GAIN-APPREC> .31<F1>
<PER-SHARE-DIVIDEND> (.39)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.01<F1>
<EXPENSE-RATIO> .84<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>014
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NATIONAL CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 92748
<INVESTMENTS-AT-VALUE> 97942
<RECEIVABLES> 1544
<ASSETS-OTHER> 645
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 100131
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 371
<TOTAL-LIABILITIES> 371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 97501
<SHARES-COMMON-STOCK> 284<F1>
<SHARES-COMMON-PRIOR> 627<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2935)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5194
<NET-ASSETS> 2279<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 239<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (71)<F1>
<NET-INVESTMENT-INCOME> 168<F1>
<REALIZED-GAINS-CURRENT> 278
<APPREC-INCREASE-CURRENT> 3753
<NET-CHANGE-FROM-OPS> 9106
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (168)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4667<F1>
<NUMBER-OF-SHARES-REDEEMED> (5024)<F1>
<SHARES-REINVESTED> 14<F1>
<NET-CHANGE-IN-ASSETS> (3833)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (3213)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 21<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 71<F1>
<AVERAGE-NET-ASSETS> 4039<F1>
<PER-SHARE-NAV-BEGIN> 7.70<F1>
<PER-SHARE-NII> .32<F1>
<PER-SHARE-GAIN-APPREC> .32<F1>
<PER-SHARE-DIVIDEND> (.32)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.02<F1>
<EXPENSE-RATIO> 1.75<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>091
<NAME> SELIGMAN MUNICIPAL FUND SERIES - COLORADO CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 46050
<INVESTMENTS-AT-VALUE> 49177
<RECEIVABLES> 923
<ASSETS-OTHER> 130
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 50230
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 212
<TOTAL-LIABILITIES> 212
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 48224
<SHARES-COMMON-STOCK> 6707<F1>
<SHARES-COMMON-PRIOR> 7193<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1333)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3127
<NET-ASSETS> 49780<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3002<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (459)<F1>
<NET-INVESTMENT-INCOME> 2543<F1>
<REALIZED-GAINS-CURRENT> (1295)
<APPREC-INCREASE-CURRENT> 2352
<NET-CHANGE-FROM-OPS> 3610
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2543)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 493<F1>
<NUMBER-OF-SHARES-REDEEMED> (1168)<F1>
<SHARES-REINVESTED> 189<F1>
<NET-CHANGE-IN-ASSETS> (2532)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (38)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 254<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 459<F1>
<AVERAGE-NET-ASSETS> 50708<F1>
<PER-SHARE-NAV-BEGIN> 7.27<F1>
<PER-SHARE-NII> .37<F1>
<PER-SHARE-GAIN-APPREC> .15<F1>
<PER-SHARE-DIVIDEND> (.37)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.42<F1>
<EXPENSE-RATIO> .90<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>094
<NAME> SELIGMAN MUNICIPAL FUND SERIES - COLORADO CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 46050
<INVESTMENTS-AT-VALUE> 49177
<RECEIVABLES> 923
<ASSETS-OTHER> 130
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 50230
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 212
<TOTAL-LIABILITIES> 212
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 48224
<SHARES-COMMON-STOCK> 32<F1>
<SHARES-COMMON-PRIOR> 35<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1333)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3127
<NET-ASSETS> 238<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 15<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (5)<F1>
<NET-INVESTMENT-INCOME> 10<F1>
<REALIZED-GAINS-CURRENT> (1295)
<APPREC-INCREASE-CURRENT> 2352
<NET-CHANGE-FROM-OPS> 3610
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (10)<F1>
<DISTRIBUTIONS-OF-GAINS> 1<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6<F1>
<NUMBER-OF-SHARES-REDEEMED> (10)<F1>
<SHARES-REINVESTED> 1<F1>
<NET-CHANGE-IN-ASSETS> (2532)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (38)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 5<F1>
<AVERAGE-NET-ASSETS> 252<F1>
<PER-SHARE-NAV-BEGIN> 7.27<F1>
<PER-SHARE-NII> .30<F1>
<PER-SHARE-GAIN-APPREC> .15<F1>
<PER-SHARE-DIVIDEND> (.30)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.42<F1>
<EXPENSE-RATIO> 1.81<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>131
<NAME> SELIGMAN MUNICIPAL FUND SERIES-GEORGIA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 49302
<INVESTMENTS-AT-VALUE> 52418
<RECEIVABLES> 912
<ASSETS-OTHER> 105
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53435
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 181
<TOTAL-LIABILITIES> 181
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 50029
<SHARES-COMMON-STOCK> 6236<F1>
<SHARES-COMMON-PRIOR> 6482<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 109
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3116
<NET-ASSETS> 50614<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2851<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (445)<F1>
<NET-INVESTMENT-INCOME> 2406<F1>
<REALIZED-GAINS-CURRENT> 118
<APPREC-INCREASE-CURRENT> 1648
<NET-CHANGE-FROM-OPS> 4263
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2406)<F1>
<DISTRIBUTIONS-OF-GAINS> (180)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 542<F1>
<NUMBER-OF-SHARES-REDEEMED> (1006)<F1>
<SHARES-REINVESTED> 218<F1>
<NET-CHANGE-IN-ASSETS> (68)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 179
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 250<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 445<F1>
<AVERAGE-NET-ASSETS> 49914<F1>
<PER-SHARE-NAV-BEGIN> 7.87<F1>
<PER-SHARE-NII> .38<F1>
<PER-SHARE-GAIN-APPREC> .28<F1>
<PER-SHARE-DIVIDEND> (.38)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.12<F1>
<EXPENSE-RATIO> .89<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>134
<NAME> SELIGMAN MUNICIPAL FUND SERIES-GEORGIA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 49302
<INVESTMENTS-AT-VALUE> 52418
<RECEIVABLES> 912
<ASSETS-OTHER> 105
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53435
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 181
<TOTAL-LIABILITIES> 181
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 50029
<SHARES-COMMON-STOCK> 324<F1>
<SHARES-COMMON-PRIOR> 295<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 109
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3116
<NET-ASSETS> 2640<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 132<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (41)<F1>
<NET-INVESTMENT-INCOME> 91<F1>
<REALIZED-GAINS-CURRENT> 118
<APPREC-INCREASE-CURRENT> 1648
<NET-CHANGE-FROM-OPS> 4263
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (91)<F1>
<DISTRIBUTIONS-OF-GAINS> (7)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 139<F1>
<NUMBER-OF-SHARES-REDEEMED> (119)<F1>
<SHARES-REINVESTED> 10<F1>
<NET-CHANGE-IN-ASSETS> (68)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 179
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 11<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 41<F1>
<AVERAGE-NET-ASSETS> 2315<F1>
<PER-SHARE-NAV-BEGIN> 7.88<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> .28<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.13<F1>
<EXPENSE-RATIO> 1.79<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>071
<NAME> SELIGMAN MUNICIPAL FUND SERIES-LOUISIANA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 52197
<INVESTMENTS-AT-VALUE> 55561
<RECEIVABLES> 1247
<ASSETS-OTHER> 125
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 56933
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 225
<TOTAL-LIABILITIES> 225
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53250
<SHARES-COMMON-STOCK> 6790<F1>
<SHARES-COMMON-PRIOR> 7014<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 93
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3364
<NET-ASSETS> 56199<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3349<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (484)<F1>
<NET-INVESTMENT-INCOME> 2865<F1>
<REALIZED-GAINS-CURRENT> 96
<APPREC-INCREASE-CURRENT> 1423
<NET-CHANGE-FROM-OPS> 4401
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2865)<F1>
<DISTRIBUTIONS-OF-GAINS> (753)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 184<F1>
<NUMBER-OF-SHARES-REDEEMED> (651)<F1>
<SHARES-REINVESTED> 243<F1>
<NET-CHANGE-IN-ASSETS> (946)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 755
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 282<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 484<F1>
<AVERAGE-NET-ASSETS> 56376<F1>
<PER-SHARE-NAV-BEGIN> 8.16<F1>
<PER-SHARE-NII> .41<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.41)<F1>
<PER-SHARE-DISTRIBUTIONS> (.11)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.28<F1>
<EXPENSE-RATIO> .86<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>081
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MARYLAND CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 50452
<INVESTMENTS-AT-VALUE> 53534
<RECEIVABLES> 966
<ASSETS-OTHER> 346
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 54846
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 234
<TOTAL-LIABILITIES> 234
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 51210
<SHARES-COMMON-STOCK> 6452<F1>
<SHARES-COMMON-PRIOR> 6765<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 320
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3082
<NET-ASSETS> 52549<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3128<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (480)<F1>
<NET-INVESTMENT-INCOME> 2648<F1>
<REALIZED-GAINS-CURRENT> 384
<APPREC-INCREASE-CURRENT> 952
<NET-CHANGE-FROM-OPS> 4065
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2648)<F1>
<DISTRIBUTIONS-OF-GAINS> (281)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 255<F1>
<NUMBER-OF-SHARES-REDEEMED> (786)<F1>
<SHARES-REINVESTED> 218<F1>
<NET-CHANGE-IN-ASSETS> (1477)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 228
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 265<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 480<F1>
<AVERAGE-NET-ASSETS> 53098<F1>
<PER-SHARE-NAV-BEGIN> 7.99<F1>
<PER-SHARE-NII> .40<F1>
<PER-SHARE-GAIN-APPREC> .19<F1>
<PER-SHARE-DIVIDEND> (.40)<F1>
<PER-SHARE-DISTRIBUTIONS> (.04)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.14<F1>
<EXPENSE-RATIO> .90<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>084
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MARYLAND CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 50452
<INVESTMENTS-AT-VALUE> 53534
<RECEIVABLES> 966
<ASSETS-OTHER> 346
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 54846
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 234
<TOTAL-LIABILITIES> 234
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 51210
<SHARES-COMMON-STOCK> 253<F1>
<SHARES-COMMON-PRIOR> 256<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 320
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3082
<NET-ASSETS> 2063<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 117<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (36)<F1>
<NET-INVESTMENT-INCOME> 81<F1>
<REALIZED-GAINS-CURRENT> 384
<APPREC-INCREASE-CURRENT> 952
<NET-CHANGE-FROM-OPS> 4065
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (81)<F1>
<DISTRIBUTIONS-OF-GAINS> (11)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 64<F1>
<NUMBER-OF-SHARES-REDEEMED> (77)<F1>
<SHARES-REINVESTED> 10<F1>
<NET-CHANGE-IN-ASSETS> (1477)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 228
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 10<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 36<F1>
<AVERAGE-NET-ASSETS> 1982<F1>
<PER-SHARE-NAV-BEGIN> 7.99<F1>
<PER-SHARE-NII> .33<F1>
<PER-SHARE-GAIN-APPREC> .20<F1>
<PER-SHARE-DIVIDEND> (.33)<F1>
<PER-SHARE-DISTRIBUTIONS> (.04)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.15<F1>
<EXPENSE-RATIO> 1.81<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>021
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MASSACHUSETTS CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 105385
<INVESTMENTS-AT-VALUE> 109948
<RECEIVABLES> 1713
<ASSETS-OTHER> 96
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 111757
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 501
<TOTAL-LIABILITIES> 501
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 105393
<SHARES-COMMON-STOCK> 13766<F1>
<SHARES-COMMON-PRIOR> 14004<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1300
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4563
<NET-ASSETS> 110011<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6429<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (912)<F1>
<NET-INVESTMENT-INCOME> 5517<F1>
<REALIZED-GAINS-CURRENT> 1305
<APPREC-INCREASE-CURRENT> 1868
<NET-CHANGE-FROM-OPS> 8747
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (5517)<F1>
<DISTRIBUTIONS-OF-GAINS> (1069)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1832<F1>
<NUMBER-OF-SHARES-REDEEMED> (2589)<F1>
<SHARES-REINVESTED> 519<F1>
<NET-CHANGE-IN-ASSETS> (21)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1078
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 545<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 912<F1>
<AVERAGE-NET-ASSETS> 109002<F1>
<PER-SHARE-NAV-BEGIN> 7.85<F1>
<PER-SHARE-NII> .40<F1>
<PER-SHARE-GAIN-APPREC> .22<F1>
<PER-SHARE-DIVIDEND> (.40)<F1>
<PER-SHARE-DISTRIBUTIONS> (.08)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.99<F1>
<EXPENSE-RATIO> .84<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>024
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MASSACHUSETTS CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 105385
<INVESTMENTS-AT-VALUE> 109948
<RECEIVABLES> 1713
<ASSETS-OTHER> 96
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 111757
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 501
<TOTAL-LIABILITIES> 501
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 105393
<SHARES-COMMON-STOCK> 156<F1>
<SHARES-COMMON-PRIOR> 179<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1300
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4563
<NET-ASSETS> 1245<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 82<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (24)<F1>
<NET-INVESTMENT-INCOME> 58<F1>
<REALIZED-GAINS-CURRENT> 1305
<APPREC-INCREASE-CURRENT> 1868
<NET-CHANGE-FROM-OPS> 8747
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (58)<F1>
<DISTRIBUTIONS-OF-GAINS> (14)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 38<F1>
<NUMBER-OF-SHARES-REDEEMED> (66)>F1>
<SHARES-REINVESTED> 5<F1>
<NET-CHANGE-IN-ASSETS> (21)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1078
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 7<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 24<F1>
<AVERAGE-NET-ASSETS> 1389<F1>
<PER-SHARE-NAV-BEGIN> 7.84<F1>
<PER-SHARE-NII> .33<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.33)<F1>
<PER-SHARE-DISTRIBUTIONS> (.08)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.99<F1>
<EXPENSE-RATIO> 1.74<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>031
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MICHIGAN CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 134630
<INVESTMENTS-AT-VALUE> 142865
<RECEIVABLES> 2783
<ASSETS-OTHER> 82
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 145730
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 515
<TOTAL-LIABILITIES> 515
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 135727
<SHARES-COMMON-STOCK> 16680<F1>
<SHARES-COMMON-PRIOR> 17517<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1253
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8235
<NET-ASSETS> 143370<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 8600<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1172)<F1>
<NET-INVESTMENT-INCOME> 7428<F1>
<REALIZED-GAINS-CURRENT> 1259
<APPREC-INCREASE-CURRENT> 2653
<NET-CHANGE-FROM-OPS> 11407
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (7428)<F1>
<DISTRIBUTIONS-OF-GAINS> (1581)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1678<F1>
<NUMBER-OF-SHARES-REDEEMED> (3184)<F1>
<SHARES-REINVESTED> 669<F1>
<NET-CHANGE-IN-ASSETS> (4449)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1593
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 723<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1173<F1>
<AVERAGE-NET-ASSETS> 144746<F1>
<PER-SHARE-NAV-BEGIN> 8.46<F1>
<PER-SHARE-NII> .43<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.43)<F1>
<PER-SHARE-DISTRIBUTIONS> (.09)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.60<F1>
<EXPENSE-RATIO> .81<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>034
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MICHIGAN CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 142865
<INVESTMENTS-AT-VALUE> 134630
<RECEIVABLES> 3583
<ASSETS-OTHER> 82
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 145730
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 515
<TOTAL-LIABILITIES> 515
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 135727
<SHARES-COMMON-STOCK> 215<F1>
<SHARES-COMMON-PRIOR> 176<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1253
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8235
<NET-ASSETS> 1845<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 94<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (27)<F1>
<NET-INVESTMENT-INCOME> 67<F1>
<REALIZED-GAINS-CURRENT> 1259
<APPREC-INCREASE-CURRENT> 2653
<NET-CHANGE-FROM-OPS> 11407
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (67)<F1>
<DISTRIBUTIONS-OF-GAINS> (18)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 114<F1>
<NUMBER-OF-SHARES-REDEEMED> (82)<F1>
<SHARES-REINVESTED> 7<F1>
<NET-CHANGE-IN-ASSETS> (4449)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1593
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 8<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 27<F1>
<AVERAGE-NET-ASSETS> 1588<F1>
<PER-SHARE-NAV-BEGIN> 8.45<F1>
<PER-SHARE-NII> .36<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.36)<F1>
<PER-SHARE-DISTRIBUTIONS> (.09)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.59<F1>
<EXPENSE-RATIO> 1.71<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>041
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MINNESOTA SERIES CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 114879
<INVESTMENTS-AT-VALUE> 121950
<RECEIVABLES> 1813
<ASSETS-OTHER> 150
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 123913
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 440
<TOTAL-LIABILITIES> 440
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 117083
<SHARES-COMMON-STOCK> 15619<F1>
<SHARES-COMMON-PRIOR> 16423<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (681)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7071
<NET-ASSETS> 121674<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7511<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1054)<F1>
<NET-INVESTMENT-INCOME> 6457<F1>
<REALIZED-GAINS-CURRENT> 758
<APPREC-INCREASE-CURRENT> 979
<NET-CHANGE-FROM-OPS> 8275
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6457)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 753<F1>
<NUMBER-OF-SHARES-REDEEMED> (2127)<F1>
<SHARES-REINVESTED> 570<F1>
<NET-CHANGE-IN-ASSETS> (4736)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1439)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 620<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1054<F1>
<AVERAGE-NET-ASSETS> 124051<F1>
<PER-SHARE-NAV-BEGIN> 7.68<F1>
<PER-SHARE-NII> .40<F1>
<PER-SHARE-GAIN-APPREC> .11<F1>
<PER-SHARE-DIVIDEND> (.40)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.79<F1>
<EXPENSE-RATIO> .85<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>044
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MINNESOTA SERIES CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 114879
<INVESTMENTS-AT-VALUE> 121950
<RECEIVABLES> 1813
<ASSETS-OTHER> 150
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 123913
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 440
<TOTAL-LIABILITIES> 440
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 117083
<SHARES-COMMON-STOCK> 231<F1>
<SHARES-COMMON-PRIOR> 265<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (681)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7071
<NET-ASSETS> 1799<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 115<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (33)<F1>
<NET-INVESTMENT-INCOME> 82<F1>
<REALIZED-GAINS-CURRENT> 758
<APPREC-INCREASE-CURRENT> 979
<NET-CHANGE-FROM-OPS> 8275
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (82)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7<F1>
<NUMBER-OF-SHARES-REDEEMED> (70)<F1>
<SHARES-REINVESTED> 29<F1>
<NET-CHANGE-IN-ASSETS> (4736)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1439)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 10<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 33<F1>
<AVERAGE-NET-ASSETS> 1903<F1>
<PER-SHARE-NAV-BEGIN> 7.68<F1>
<PER-SHARE-NII> .33<F1>
<PER-SHARE-GAIN-APPREC> .11<F1>
<PER-SHARE-DIVIDEND> (.33)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.79<F1>
<EXPENSE-RATIO> 1.75<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>101
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MISSOURI CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 49549
<INVESTMENTS-AT-VALUE> 52069
<RECEIVABLES> 1285
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53432
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 192
<TOTAL-LIABILITIES> 192
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 50335
<SHARES-COMMON-STOCK> 6749<F1>
<SHARES-COMMON-PRIOR> 6474<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 385
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2520
<NET-ASSETS> 52766<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3028<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (465)<F1>
<NET-INVESTMENT-INCOME> 2563<F1>
<REALIZED-GAINS-CURRENT> 390
<APPREC-INCREASE-CURRENT> 900
<NET-CHANGE-FROM-OPS> 3873
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2563)<F1>
<DISTRIBUTIONS-OF-GAINS> (542)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 754<F1>
<NUMBER-OF-SHARES-REDEEMED> (686)<F1>
<SHARES-REINVESTED> 207<F1>
<NET-CHANGE-IN-ASSETS> 2733
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 543
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 261<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 465<F1>
<AVERAGE-NET-ASSETS> 52057<F1>
<PER-SHARE-NAV-BEGIN> 7.71<F1>
<PER-SHARE-NII> .38<F1>
<PER-SHARE-GAIN-APPREC> .19<F1>
<PER-SHARE-DIVIDEND> (.38)<F1>
<PER-SHARE-DISTRIBUTIONS> (.08)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.82<F1>
<EXPENSE-RATIO> .89<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>104
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MISSOURI CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 49549
<INVESTMENTS-AT-VALUE> 52069
<RECEIVABLES> 1285
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53432
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 192
<TOTAL-LIABILITIES> 192
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 50335
<SHARES-COMMON-STOCK> 61<F1>
<SHARES-COMMON-PRIOR> 73<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 385
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2520
<NET-ASSETS> 474<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 29<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (9)<F1>
<NET-INVESTMENT-INCOME> 20<F1>
<REALIZED-GAINS-CURRENT> 390
<APPREC-INCREASE-CURRENT> 900
<NET-CHANGE-FROM-OPS> 3873
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (20)<F1>
<DISTRIBUTIONS-OF-GAINS> (6)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5<F1>
<NUMBER-OF-SHARES-REDEEMED> (20)<F1>
<SHARES-REINVESTED> 3<F1>
<NET-CHANGE-IN-ASSETS> 2733
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 543
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9<F1>
<AVERAGE-NET-ASSETS> 490<F1>
<PER-SHARE-NAV-BEGIN> 7.72<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> .18<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.08)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.82<F1>
<EXPENSE-RATIO> 1.80<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>051
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NEW YORK CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 78316
<INVESTMENTS-AT-VALUE> 83986
<RECEIVABLES> 1291
<ASSETS-OTHER> 132
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 85410
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 310
<TOTAL-LIABILITIES> 310
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 79231
<SHARES-COMMON-STOCK> 10086<F1>
<SHARES-COMMON-PRIOR> 10372<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 199
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5670
<NET-ASSETS> 83528<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4850<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (674)<F1>
<NET-INVESTMENT-INCOME> 4176<F1>
<REALIZED-GAINS-CURRENT> 200
<APPREC-INCREASE-CURRENT> 3172
<NET-CHANGE-FROM-OPS> 7600
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4176)<F1>
<DISTRIBUTIONS-OF-GAINS> (213)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1027<F1>
<NUMBER-OF-SHARES-REDEEMED> (1635)<F1>
<SHARES-REINVESTED> 322<F1>
<NET-CHANGE-IN-ASSETS> 1228
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 215
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 411<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 674<F1>
<AVERAGE-NET-ASSETS> 82069<F1>
<PER-SHARE-NAV-BEGIN> 7.98<F1>
<PER-SHARE-NII> .41<F1>
<PER-SHARE-GAIN-APPREC> .32<F1>
<PER-SHARE-DIVIDEND> (.41)<F1>
<PER-SHARE-DISTRIBUTIONS> (.02)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.28<F1>
<EXPENSE-RATIO> .82<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>054
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NEW YORK CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 78316
<INVESTMENTS-AT-VALUE> 83986
<RECEIVABLES> 1291
<ASSETS-OTHER> 132
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 85410
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 310
<TOTAL-LIABILITIES> 310
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 79231
<SHARES-COMMON-STOCK> 190<F1>
<SHARES-COMMON-PRIOR> 144<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 199
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5670
<NET-ASSETS> 1572<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 75<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (22)<F1>
<NET-INVESTMENT-INCOME> 53<F1>
<REALIZED-GAINS-CURRENT> 200
<APPREC-INCREASE-CURRENT> 3172
<NET-CHANGE-FROM-OPS> 7600
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (53)<F1>
<DISTRIBUTIONS-OF-GAINS> (3)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 54<F1>
<NUMBER-OF-SHARES-REDEEMED> (13)<F1>
<SHARES-REINVESTED> 5<F1>
<NET-CHANGE-IN-ASSETS> 1228
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 215
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 22<F1>
<AVERAGE-NET-ASSETS> 1257<F1>
<PER-SHARE-NAV-BEGIN> 7.98<F1>
<PER-SHARE-NII> .34<F1>
<PER-SHARE-GAIN-APPREC> .33<F1>
<PER-SHARE-DIVIDEND> (.34)<F1>
<PER-SHARE-DISTRIBUTIONS> (.02)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.29<F1>
<EXPENSE-RATIO> 1.73<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>061
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OHIO CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 144226
<INVESTMENTS-AT-VALUE> 1153467
<RECEIVABLES> 2702
<ASSETS-OTHER> 81
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 156250
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 671
<TOTAL-LIABILITIES> 671
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 145296
<SHARES-COMMON-STOCK> 18862<F1>
<SHARES-COMMON-PRIOR> 20051<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1042
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9241
<NET-ASSETS> 154419<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 9385<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1267)<F1>
<NET-INVESTMENT-INCOME> 8118<F1>
<REALIZED-GAINS-CURRENT> 1052
<APPREC-INCREASE-CURRENT> 2122
<NET-CHANGE-FROM-OPS> 11335
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (8118)<F1>
<DISTRIBUTIONS-OF-GAINS> (1383)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 548<F1>
<NUMBER-OF-SHARES-REDEEMED> (2495)<F1>
<SHARES-REINVESTED> 758<F1>
<NET-CHANGE-IN-ASSETS> (7674)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1381
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 782<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1267<F1>
<AVERAGE-NET-ASSETS> 156501<F1>
<PER-SHARE-NAV-BEGIN> 8.09<F1>
<PER-SHARE-NII> .42<F1>
<PER-SHARE-GAIN-APPREC> .17<F1)
<PER-SHARE-DIVIDEND> (.42)<F1>
<PER-SHARE-DISTRIBUTIONS> (.07)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.19<F1>
<EXPENSE-RATIO> .81<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>064
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OHIO CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 144226
<INVESTMENTS-AT-VALUE> 153467
<RECEIVABLES> 2702
<ASSETS-OTHER> 81
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 156250
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 671
<TOTAL-LIABILITIES> 671
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 145296
<SHARES-COMMON-STOCK> 141<F1>
<SHARES-COMMON-PRIOR> 124<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1042
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9241
<NET-ASSETS> 1160<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 60<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (17)<F1>
<NET-INVESTMENT-INCOME> 43<F1>
<REALIZED-GAINS-CURRENT> 1052
<APPREC-INCREASE-CURRENT> 2122
<NET-CHANGE-FROM-OPS> 11335
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (43)<F1>
<DISTRIBUTIONS-OF-GAINS> (8)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 45<F1>
<NUMBER-OF-SHARES-REDEEMED> (34)<F1>
<SHARES-REINVESTED> 6<F1>
<NET-CHANGE-IN-ASSETS> (7674)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1381
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 17<F1>
<AVERAGE-NET-ASSETS> 994<F1>
<PER-SHARE-NAV-BEGIN> 8.13<F1>
<PER-SHARE-NII> .35<F1>
<PER-SHARE-GAIN-APPREC> .17<F1)
<PER-SHARE-DIVIDEND> (.35)<F1>
<PER-SHARE-DISTRIBUTIONS> (.07)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.23<F1>
<EXPENSE-RATIO> 1.71<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>111
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OREGON CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 53026
<INVESTMENTS-AT-VALUE> 55744
<RECEIVABLES> 1070
<ASSETS-OTHER> 285
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 57099
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 182
<TOTAL-LIABILITIES> 182
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53481
<SHARES-COMMON-STOCK> 7016<F1>
<SHARES-COMMON-PRIOR> 7499<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 718
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2718
<NET-ASSETS> 55239<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3212<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (499)<F1>
<NET-INVESTMENT-INCOME> 2713<F1>
<REALIZED-GAINS-CURRENT> 748
<APPREC-INCREASE-CURRENT> 1208
<NET-CHANGE-FROM-OPS> 4728
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2713)<F1>
<DISTRIBUTIONS-OF-GAINS> (305)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 270<F1>
<NUMBER-OF-SHARES-REDEEMED> (1006)<F1>
<SHARES-REINVESTED> 253<F1>
<NET-CHANGE-IN-ASSETS> (1968)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 282
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 278<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 499<F1>
<AVERAGE-NET-ASSETS> 55547<F1>
<PER-SHARE-NAV-BEGIN> 7.65<F1>
<PER-SHARE-NII> .38<F1>
<PER-SHARE-GAIN-APPREC> .26<F1>
<PER-SHARE-DIVIDEND> (.38)<F1>
<PER-SHARE-DISTRIBUTIONS> (.04)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.87<F1>
<EXPENSE-RATIO> .90<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>114
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OREGON CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 53026
<INVESTMENTS-AT-VALUE> 55744
<RECEIVABLES> 1070
<ASSETS-OTHER> 285
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 57099
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 182
<TOTAL-LIABILITIES> 182
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53481
<SHARES-COMMON-STOCK> 213<F1>
<SHARES-COMMON-PRIOR> 201<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 718
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2718
<NET-ASSETS> 1678<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 85<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (26)<F1>
<NET-INVESTMENT-INCOME> 59<F1>
<REALIZED-GAINS-CURRENT> 748
<APPREC-INCREASE-CURRENT> 1208
<NET-CHANGE-FROM-OPS> 4728
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (59)<F1>
<DISTRIBUTIONS-OF-GAINS> (8)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 81<F1>
<NUMBER-OF-SHARES-REDEEMED> (75)<F1>
<SHARES-REINVESTED> 6<F1>
<NET-CHANGE-IN-ASSETS> (1968)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 282
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 7<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 26<F1>
<AVERAGE-NET-ASSETS> 1478<F1>
<PER-SHARE-NAV-BEGIN> 7.64<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> .27<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.04)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.87<F1>
<EXPENSE-RATIO> 1.80<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>151
<NAME> SELIGMAN MUNICIPAL FUND SERIES-SOUTH CAROLINA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 97379
<INVESTMENTS-AT-VALUE> 103262
<RECEIVABLES> 1713
<ASSETS-OTHER> 102
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 105077
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 396
<TOTAL-LIABILITIES> 396
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 98348
<SHARES-COMMON-STOCK> 12375<F1>
<SHARES-COMMON-PRIOR> 13400<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 450
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5883
<NET-ASSETS> 101018<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6112<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (872)<F1>
<NET-INVESTMENT-INCOME> 5240<F1>
<REALIZED-GAINS-CURRENT> 452
<APPREC-INCREASE-CURRENT> 2382
<NET-CHANGE-FROM-OPS> 8205
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (5240)<F1>
<DISTRIBUTIONS-OF-GAINS> (1668)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 621<F1>
<NUMBER-OF-SHARES-REDEEMED> (2188)<F1>
<SHARES-REINVESTED> 542<F1>
<NET-CHANGE-IN-ASSETS> (6196)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1708
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 519<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 872<F1>
<AVERAGE-NET-ASSETS> 103907<F1>
<PER-SHARE-NAV-BEGIN> 8.07<F1>
<PER-SHARE-NII> .40<F1>
<PER-SHARE-GAIN-APPREC> .22<F1>
<PER-SHARE-DIVIDEND> (.40)<F1>
<PER-SHARE-DISTRIBUTIONS> (.13)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.16<F1>
<EXPENSE-RATIO> .84<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>154
<NAME> SELIGMAN MUNICIPAL FUND SERIES-SOUTH CAROLINA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 97379
<INVESTMENTS-AT-VALUE> 103262
<RECEIVABLES> 2913
<ASSETS-OTHER> 102
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 105077
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 396
<TOTAL-LIABILITIES> 396
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 98348
<SHARES-COMMON-STOCK> 449<F1>
<SHARES-COMMON-PRIOR> 337<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 450
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5883
<NET-ASSETS> 3663<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 186<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (55)<F1>
<NET-INVESTMENT-INCOME> 131<F1>
<REALIZED-GAINS-CURRENT> 452
<APPREC-INCREASE-CURRENT> 2382
<NET-CHANGE-FROM-OPS> 8205
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (131)<F1>
<DISTRIBUTIONS-OF-GAINS> (42)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 160<F1>
<NUMBER-OF-SHARES-REDEEMED> (67)<F1>
<SHARES-REINVESTED> 19<F1>
<NET-CHANGE-IN-ASSETS> (6196)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1708
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 55<F1>
<AVERAGE-NET-ASSETS> 3168<F1>
<PER-SHARE-NAV-BEGIN> 8.06<F1>
<PER-SHARE-NII> .33<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.33)<F1>
<PER-SHARE-DISTRIBUTIONS> (.13)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.16<F1>
<EXPENSE-RATIO> 1.74<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
INDEPENDENT AUDITORS' REPORT
The Board of Directors
Seligman Municipal Fund Series, Inc.
In planning and performing our audit of the financial statements of Seligman
Municipal Fund Series, Inc. (the "Fund") for the year ended September 30, 1997,
we considered its internal control structure, including procedures for
safeguarding securities, in order to determine our auditing procedures for the
purpose of expressing an opinion on the financial statements and to comply with
the requirements of Form N-SAR, not to provide assurance on the internal control
structure.
The management of the Fund is responsible for establishing and maintaining an
internal control structure. In fulfilling this responsibility, estimates and
judgments by management are required to assess the expected benefits and related
costs of internal control structure policies and procedures. Two of the
objectives of an internal control structure are to provide management with
reasonable, but not absolute, assurance that assets are safeguarded against loss
from unauthorized use or disposition and that transactions are executed in
accordance with management's authorization and recorded properly to permit the
preparation of financial statements in conformity with generally accepted
accounting principles.
Because of the inherent limitations in any internal control structure, errors or
irregularities may occur and not be detected. Also, projection of any evaluation
of the structure to future periods is subject to the risk that it may be
inadequate because of changes in conditions or that the effectiveness of the
design and operation may deteriorate.
Our consideration of internal control structure would not necessarily disclose
all matters in the internal control structure that might be material weaknesses
under standards established by the American Institute of Certified Public
Accountants. A material weakness is a condition in which the design or operation
of the specific internal control structure elements does not reduce to a
relatively low level the risk that errors or irregularities in amounts that
would be material in relation to the financial statements being audited may
occur and not be detected within a timely period by employees in the normal
course of performing their assigned functions. However, we noted no matters
involving the internal control structure, including procedures for safeguarding
securities, that we consider to be material weaknesses as defined above as of
September 30, 1997.
This report is intended solely for the information and use of management and the
Securities and Exchange Commission.
October 31, 1997
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