Matches in Library of Congress for { ?s ?p 1981. }
- 80000671%2F%2Fr87 date "1981".
- 80000675%2F%2Fr97 date "1981".
- 80000679 date "1981".
- 80000684 date "1981".
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- 80000721%2F%2Fr92 date "1981".
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- 80000977%2F%2Fr84 date "1981".
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- 80001091%2F%2Fr85 date "1981".
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- 80001104 date "1981".
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- 80001117%2F%2Fr84 date "1981".
- 80001118%2F%2Fr94 date "1981".
- 80001119%2FMN date "1981".
- 80001120 date "1981".