Matches in Library of Congress for { ?s ?p 1981. }
- 81000003 date "1981".
- 81000004 date "1981".
- 81000006 date "1981".
- 81000007%2F%2Fr832 date "1981".
- 81000008 date "1981".
- 81000009 date "1981".
- 81000010 date "1981".
- 81000011%2F%2Fr942 date "1981".
- 81000012 date "1981".
- 81000014 date "1981".
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- 81000016 date "1981".
- 81000017 date "1981".
- 81000018 date "1981".
- 81000019 date "1981".
- 81000021 date "1981".
- 81000022 date "1981".
- 81000023%2FMN%2Fr86 date "1981".
- 81000024%2FMN%2Fr82 date "1981".
- 81000025%2FMN%2Fr863 date "1981".
- 81000026%2F%2Fr82 date "1981".
- 81000027 date "1981".
- 81000028 date "1981".
- 81000030 date "1981".
- 81000031 date "1981".
- 81000032 date "1981".
- 81000033 date "1981".
- 81000034%2F%2Fr862 date "1981".
- 81000035 date "1981".
- 81000036 date "1981".
- 81000037 date "1981".
- 81000039 date "1981".
- 81000040 date "1981".
- 81000041 date "1981".
- 81000042 date "1981".
- 81000043 date "1981".
- 81000045 date "1981".
- 81000046 date "1981".
- 81000047%2F%2Fr83 date "1981".
- 81000048 date "1981".
- 81000049 date "1981".
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- 81000056 date "1981".
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- 81000068 date "1981".
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- 81000080 date "1981".
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- 81000083 date "1981".
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- 81000089 date "1981".
- 81000090%2F%2Fr933 date "1981".
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- 81000092%2F%2Fr84 date "1981".
- 81000093 date "1981".
- 81000094 date "1981".
- 81000095 date "1981".
- 81000096 date "1981".
- 81000097 date "1981".
- 81000098 date "1981".
- 81000100 date "1981".
- 81000101 date "1981".
- 81000102 date "1981".
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- 81000104 date "1981".
- 81000105 date "1981".
- 81000107 date "1981".
- 81000108 date "1981".
- 81000109 date "1981".
- 81000110 date "1981".
- 81000111 date "1981".
- 81000112 date "1981".
- 81000113 date "1981".
- 81000114 date "1981".
- 81000115%2F%2Fr88 date "1981".
- 81000116 date "1981".
- 81000117%2F%2Fr86 date "1981".