Matches in Library of Congress for { ?s ?p 1981. }
- 80008222%2F%2Fr92 date "1981".
- 80008223 date "1981".
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- 80008488%2F%2Fr972 date "1981".
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- 80008491%2F%2Fr90 date "1981".
- 80008492%2F%2Fr96 date "1981".