Matches in Library of Congress for { ?s ?p 621.9 20. }
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- 89037818 subject "621.9 20".
- 89064000 subject "621.9 20".
- 89156056 subject "621.9 20".
- 90037846 subject "621.9 20".
- 91000257 subject "621.9 20".
- 91038808 subject "621.9 20".
- 92003871 subject "621.9 20".
- 92131034%2F%2Fr95 subject "621.9 20".
- 92136143 subject "621.9 20".
- 93003533 subject "621.9 20".
- 93029808 subject "621.9 20".
- 93127456 subject "621.9 20".
- 93154562 subject "621.9 20".
- 93232530 subject "621.9 20".
- 94005308 subject "621.9 20".
- 94034450 subject "621.9 20".
- 94060677 subject "621.9 20".
- 94074288%2F%2Fr98 subject "621.9 20".
- 94237941 subject "621.9 20".
- 95003750 subject "621.9 20".