Matches in Library of Congress for { ?s ?p 1981. }
- 80019582%2F%2Fr854 date "1981".
- 80019584 date "1981".
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- 80019851 date "1981".
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- 80019860%2F%2Fr87 date "1981".
- 80019861 date "1981".
- 80019864 date "1981".