Matches in Library of Congress for { ?s ?p 1981. }
- 80020299 date "1981".
- 80020302 date "1981".
- 80020304 date "1981".
- 80020306 date "1981".
- 80020307%2F%2Fr93 date "1981".
- 80020308 date "1981".
- 80020309%2F%2Fr93 date "1981".
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- 80020333 date "1981".
- 80020334 date "1981".
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- 80020338 date "1981".
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- 80020397%2F%2Fr922 date "1981".
- 80020399 date "1981".
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- 80020453 date "1981".
- 80020454 date "1981".
- 80020455 date "1981".
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- 80020480 date "1981".
- 80020487 date "1981".
- 80020488 date "1981".
- 80020490 date "1981".
- 80020491%2F%2Fr85 date "1981".
- 80020492%2F%2Fr93 date "1981".
- 80020494 date "1981".
- 80020497 date "1981".
- 80020498 date "1981".
- 80020499%2F%2Fr963 date "1981".