Matches in Library of Congress for { ?s ?p 1981. }
- 80071003 date "1981".
- 80071004 date "1981".
- 80071005%2F%2Fr92 date "1981".
- 80071008%2F%2Fr902 date "1981".
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- 80071042 date "1981".
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- 80071051 date "1981".
- 80071052 date "1981".
- 80071053 date "1981".
- 80071054%2F%2Fr96 date "1981".
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- 80071057 date "1981".
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- 80080894 date "1981".
- 80080895 date "1981".
- 80080901 date "1981".
- 80080961 date "1981".
- 80080973 date "1981".