Matches in Library of Congress for { ?s ?p 1981. }
- 80068135 date "1981".
- 80068140%2F%2Fr97 date "1981".
- 80068141 date "1981".
- 80068142%2F%2Fr85 date "1981".
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- 80068532 date "1981".
- 80068533%2F%2Fr85 date "1981".
- 80068537 date "1981".
- 80068539 date "1981".
- 80068540 date "1981".