CALVERT SOCIAL INVESTMENT FUND
NSAR-A, 1996-05-23
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<PAGE>      PAGE  1
000 A000000 03/31/96
000 C000000 0000356682
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 CALVERT SOCIAL INVESTMENT FUND
001 B000000 811-3334
001 C000000 3019514881
002 A000000 4550 MONTGOMERY AVE., SUITE 1000N
002 B000000 BETHESDA
002 C000000 MD
002 D010000 20814
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  4
007 C010100  1
007 C020100 MONEY MARKET PORTFOLIO
007 C030100 N
007 C010200  2
007 C020200 MANAGED GROWTH PORTFOLIO
007 C030200 N
007 C010300  3
007 C020300 BOND PORTFOLIO
007 C030300 N
007 C010400  4
007 C020400 EQUITY PORTFOLIO
007 C030400 N
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
011 A00AA01 CALVERT DISTRIBUTORS, INC.
011 B00AA01 8-47915
011 C01AA01 BETHESDA
011 C02AA01 MD
011 C03AA01 20814
013 A00AA01 COOPERS & LYBRAND
013 B01AA01 BALTIMORE
013 B02AA01 MD
013 B03AA01 21202
020 A000001 SIMPSON MCKIE
020 C000001     78
<PAGE>      PAGE  2
020 A000002 WEEDEN & CO
020 C000002     37
020 A000003 INSTINET
020 C000003     25
020 A000004 GOLDMAN SACHS & CO
020 C000004     23
020 A000005 WHEAT FIRST BUTCHER SINGER, INC.
020 C000005     21
020 A000006 DONALDSON LUFKIN & JENRETTE SECURITIES CO
020 C000006     21
020 A000007 JEFFERIES & CO
020 C000007     21
020 A000008 BEAR STEARNS SECURITIES CORP
020 C000008     19
020 A000009 SMITH BARNEY INC
020 C000009     17
020 A000010 AUTRANET, INC
020 C000010     15
021  000000      487
022 A000001 DONALDSON LUFKIN AND JENRETTE
022 C000001    759725
022 D000001      9401
022 A000002 STATE STREET BANK AND TRUST
022 C000002    679200
022 D000002         0
022 A000003 MERRILL LYNCH
022 C000003     96389
022 D000003     81180
022 A000004 UNION BANK OF SWITZERLAND
022 C000004    115353
022 D000004         0
022 A000005 PAINE WEBBER
022 C000005     96349
022 D000005      8319
022 A000006 GOLDMAN SACHS
022 C000006     27230
022 D000006     27423
022 A000007 DEAN WITTER REYNOLDS
022 C000007     24095
022 D000007     25506
022 A000008 SALOMON BROTHERS
022 C000008     31103
022 D000008     18446
022 A000009 LEHMAN BROTHERS
022 C000009     21632
022 D000009     19298
022 A000010 BANK OF AMERICA
022 C000010     28171
022 D000010     11979
023 C000000    2200496
023 D000000     406349
<PAGE>      PAGE  3
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<PAGE>      PAGE  4
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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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  18
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<PAGE>      PAGE  19
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SIGNATURE   WILLIAM M. TARTIKOFF                         
TITLE       GENERAL COUNSEL     
 


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   <NAME> BOND PORTFOLIO, CLASS C
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</TABLE>

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</TABLE>


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