Matches in Library of Congress for { ?s ?p 1981. }
- 81000118 date "1981".
- 81000119 date "1981".
- 81000120%2F%2Fr97 date "1981".
- 81000121 date "1981".
- 81000122 date "1981".
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- 81000128 date "1981".
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- 81000136 date "1981".
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- 81000142 date "1981".
- 81000143 date "1981".
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- 81000204 date "1981".
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- 81000206 date "1981".
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- 81000209%2F%2Fr973 date "1981".
- 81000210%2F%2Fr83 date "1981".
- 81000212 date "1981".
- 81000213 date "1981".
- 81000214 date "1981".
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- 81000228 date "1981".
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- 81000230 date "1981".
- 81000231 date "1981".
- 81000232 date "1981".
- 81000233 date "1981".
- 81000234 date "1981".
- 81000235 date "1981".
- 81000236 date "1981".