Matches in Library of Congress for { ?s ?p 1981. }
- 80027519%2F%2Fr892 date "1981".
- 80027520 date "1981".
- 80027523 date "1981".
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- 80027626%2F%2Fr89 date "1981".
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- 80027647%2F%2Fr93 date "1981".
- 80027648 date "1981".
- 80027649 date "1981".
- 80027650%2F%2Fr89 date "1981".
- 80027651 date "1981".