Matches in Library of Congress for { ?s ?p 1981. }
- 81000713 date "1981".
- 81000714 date "1981".
- 81000715 date "1981".
- 81000717%2F%2Fr85 date "1981".
- 81000718%2F%2Fr912 date "1981".
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- 81000777 date "1981".
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- 81000804%2F%2Fr93 date "1981".
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- 81000821 date "1981".
- 81000822 date "1981".
- 81000823%2F%2Fr85 date "1981".
- 81000824 date "1981".
- 81000825 date "1981".