Matches in Library of Congress for { ?s ?p Environmental policy West (U.S.) History 20th century.. }
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- 2002001555 subject "Environmental policy West (U.S.) History 20th century.".
- 2002002786 subject "Environmental policy West (U.S.) History 20th century.".
- 2002004950 subject "Environmental policy West (U.S.) History 20th century.".
- 2008052227 subject "Environmental policy West (U.S.) History 20th century.".