Matches in Library of Congress for { ?s ?p 688.6 20. }
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- 81201450 subject "688.6 20".
- 88050623 subject "688.6 20".
- 89031365 subject "688.6 20".
- 89127959 subject "688.6 20".
- 89150887%2F%2Fr96 subject "688.6 20".
- 90137058 subject "688.6 20".
- 90147555 subject "688.6 20".
- 90180420 subject "688.6 20".
- 91144271 subject "688.6 20".
- 92039143 subject "688.6 20".
- 92060042%2F%2Fr95 subject "688.6 20".
- 93000958 subject "688.6 20".
- 94070620 subject "688.6 20".
- 94171460 subject "688.6 20".
- 95075706 subject "688.6 20".
- 95216541 subject "688.6 20".
- 96031919 subject "688.6 20".
- 96034191 subject "688.6 20".