Matches in Library of Congress for { ?s ?p 581.1 20. }
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- 02015116%2F%2Fr983 subject "581.1 20".
- 89013341 subject "581.1 20".
- 89136593 subject "581.1 20".
- 90000580 subject "581.1 20".
- 90025748 subject "581.1 20".
- 90901206%2F%2Fr91 subject "581.1 20".
- 91007362 subject "581.1 20".
- 91009042 subject "581.1 20".
- 91011129 subject "581.1 20".
- 91174842 subject "581.1 20".
- 92134622 subject "581.1 20".
- 93019879 subject "581.1 20".
- 93031986 subject "581.1 20".
- 93215659 subject "581.1 20".
- 93902404 subject "581.1 20".
- 94012436 subject "581.1 20".
- 94021765 subject "581.1 20".
- 94032077%2F%2Fr95 subject "581.1 20".
- 94034692 subject "581.1 20".
- 94048901 subject "581.1 20".
- 95010872 subject "581.1 20".