Matches in Library of Congress for { ?s ?p 1981. }
- 80027899 date "1981".
- 80027900%2F%2Fr97 date "1981".
- 80027901 date "1981".
- 80027903 date "1981".
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- 80028018 date "1981".
- 80028022 date "1981".
- 80028023 date "1981".