Matches in Library of Congress for { ?s ?p 1981. }
- 80017822%2F%2Fr872 date "1981".
- 80017826 date "1981".
- 80017828 date "1981".
- 80017835 date "1981".
- 80017840 date "1981".
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- 80018118%2F%2Fr83 date "1981".
- 80018122 date "1981".