Matches in Library of Congress for { ?s ?p 221.6/4 20. }
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- 88051177 subject "221.6/4 20".
- 88126642 subject "221.6/4 20".
- 89140844 subject "221.6/4 20".
- 90020914 subject "221.6/4 20".
- 90034274 subject "221.6/4 20".
- 91143246 subject "221.6/4 20".
- 91195659 subject "221.6/4 20".
- 94152796 subject "221.6/4 20".
- 95011897 subject "221.6/4 20".
- 96022347 subject "221.6/4 20".