Matches in Library of Congress for { ?s ?p 491.6 20. }
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- 90000033 subject "491.6 20".
- 90003040 subject "491.6 20".
- 90031745 subject "491.6 20".
- 90170893 subject "491.6 20".
- 91034225 subject "491.6 20".
- 91034570 subject "491.6 20".
- 91038316 subject "491.6 20".
- 91154877 subject "491.6 20".
- 91179495%2F%2Fr91 subject "491.6 20".
- 92198189 subject "491.6 20".
- 93215643 subject "491.6 20".
- 94044203 subject "491.6 20".
- 94128110 subject "491.6 20".
- 94214458 subject "491.6 20".
- 95014193 subject "491.6 20".
- 95109124 subject "491.6 20".
- 95158026 subject "491.6 20".