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Toward an Environmental Policy

其他書名	The Policy and Editorial Comment of the National Parks and Conservation Association Over the Years of the Expanded Program, 1958-1971
出版	National Parks and Conservation Association, 1971
URL	http://books.google.com.hk/books?id=Nfs8AAAAYAAJ&hl=&source=gbs_api

註釋"The policy and editorial comment of the National Parks and Conservation Association over the years of the expanded program, 1958-1971."--T.p.