CALVERT SOCIAL INVESTMENT FUND
NSAR-B, 1996-12-13
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<PAGE>      PAGE  1
000 B000000 09/30/96
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
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<PAGE>      PAGE  2
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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 INSTINET
020 C000001     96
020 A000002 WEEDEN & CO
<PAGE>      PAGE  3
020 C000002     79
020 A000003 SIMPSON MCKIE
020 C000003     78
020 A000004 AUTRANET INC.
020 C000004     53
020 A000005 BEAR STEARN
020 C000005     49
020 A000006 WHEAT FIRST
020 C000006     44
020 A000007 DEAN WITTER REYNOLDS
020 C000007     42
020 A000008 SMITH BARNEY INC.
020 C000008     40
020 A000009 GOLDS GOLDMAN SACHS
020 C000009     39
020 A000010 JEFFERIES & CO.
020 C000010     37
021  000000     1046
022 A000001 DONALDSON & CO INCOR
022 C000001   1571720
022 D000001     13921
022 A000002 STATE STREET BANK AND TRUST
022 C000002    887800
022 D000002         0
022 A000003 UBS SEC
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022 D000006     48005
022 A000007 SMITH BARNEY INC.
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022 A000008 DEUTSCHE BANK SECURI
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022 D000008     51059
022 A000009 GOLDS GOLDMAN SACHS
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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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<PAGE>      PAGE  20
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SIGNATURE   WILLIAM M. TARTIKOFF                         
TITLE       GENERAL COUNSEL     
 


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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<TABLE> <S> <C>

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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<CIK> 0000356682
<NAME> CALVERT SOCIAL INVESTMENT FUND
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</TABLE>

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