Matches in Library of Congress for { ?s ?p 1981. }
- 80015683 date "1981".
- 80015684%2F%2Fr94 date "1981".
- 80015688 date "1981".
- 80015690 date "1981".
- 80015692 date "1981".
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- 80015788%2F%2Fr84 date "1981".
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- 80015822%2F%2Fr83 date "1981".
- 80015824%2F%2Fr872 date "1981".
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- 80015940 date "1981".
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- 80016001 date "1981".
- 80016006 date "1981".
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- 80016017 date "1981".
- 80016026 date "1981".
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- 80016102 date "1981".
- 80016129%2F%2Fr83 date "1981".
- 80016136 date "1981".
- 80016141%2F%2Fr91 date "1981".
- 80016148 date "1981".
- 80016152 date "1981".
- 80016157 date "1981".