Matches in Library of Congress for { ?s ?p 1981. }
- 80018712 date "1981".
- 80018714 date "1981".
- 80018716%2F%2Fr83 date "1981".
- 80018717 date "1981".
- 80018721%2F%2Fr83 date "1981".
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- 80018724 date "1981".
- 80018733 date "1981".
- 80018734 date "1981".
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- 80018962 date "1981".
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- 80018999 date "1981".
- 80019001 date "1981".
- 80019003 date "1981".
- 80019004 date "1981".
- 80019006 date "1981".
- 80019009 date "1981".
- 80019012 date "1981".
- 80019013 date "1981".
- 80019019 date "1981".
- 80019021 date "1981".
- 80019022 date "1981".