Matches in Library of Congress for { ?s ?p 688.7/221 20. }
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- 83112802 subject "688.7/221 20".
- 89017351%2F%2Fr93 subject "688.7/221 20".
- 89204790 subject "688.7/221 20".
- 92003498 subject "688.7/221 20".
- 92082867 subject "688.7/221 20".
- 92103126 subject "688.7/221 20".
- 93110176%2F%2Fr93 subject "688.7/221 20".
- 93118681 subject "688.7/221 20".
- 94073867 subject "688.7/221 20".
- 96104086 subject "688.7/221 20".