Matches in Library of Congress for { ?s ?p 1981. }
- 80028715%2F%2Fr883 date "1981".
- 80028716 date "1981".
- 80028717 date "1981".
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- 80028827 date "1981".
- 80028828 date "1981".
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- 80028830%2F%2Fr83 date "1981".
- 80028831 date "1981".