Matches in Library of Congress for { ?s ?p 1981. }
- 80023457%2F%2Fr88 date "1981".
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- 80023625%2F%2Fr92 date "1981".
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- 80023632 date "1981".
- 80023633 date "1981".
- 80023635%2F%2Fr86 date "1981".
- 80023636%2F%2Fr872 date "1981".
- 80023637 date "1981".