Matches in Library of Congress for { ?s ?p 1981. }
- 80025538%2F%2Fr91 date "1981".
- 80025540 date "1981".
- 80025541 date "1981".
- 80025543 date "1981".
- 80025544 date "1981".
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- 80025658 date "1981".
- 80025660 date "1981".