Matches in Library of Congress for { ?s ?p 621.2 20. }
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- 82130383 subject "621.2 20".
- 85207654 subject "621.2 20".
- 89023584 subject "621.2 20".
- 89023670 subject "621.2 20".
- 90004284 subject "621.2 20".
- 90008855 subject "621.2 20".
- 90039388 subject "621.2 20".
- 90055406 subject "621.2 20".
- 91134963 subject "621.2 20".
- 91153663 subject "621.2 20".
- 91188392 subject "621.2 20".
- 91206119 subject "621.2 20".
- 92022278 subject "621.2 20".
- 92085560 subject "621.2 20".
- 92100764 subject "621.2 20".
- 92132044 subject "621.2 20".
- 93008853 subject "621.2 20".
- 93159113 subject "621.2 20".
- 93213191 subject "621.2 20".
- 94071579 subject "621.2 20".
- 94108600 subject "621.2 20".
- 95033237 subject "621.2 20".
- 95043128 subject "621.2 20".
- 96004044 subject "621.2 20".
- 96011155 subject "621.2 20".
- 96018766 subject "621.2 20".
- 96027199%2F%2Fr97 subject "621.2 20".
- 96027438 subject "621.2 20".
- 96117527 subject "621.2 20".