Matches in Library of Congress for { ?s ?p 539.7/21 20. }
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- 88172860 subject "539.7/21 20".
- 89038530 subject "539.7/21 20".
- 89123080 subject "539.7/21 20".
- 90002395 subject "539.7/21 20".
- 90007502 subject "539.7/21 20".
- 90007749 subject "539.7/21 20".
- 91022692 subject "539.7/21 20".
- 92012642 subject "539.7/21 20".
- 93131769 subject "539.7/21 20".
- 94038551 subject "539.7/21 20".