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The Hoover Dam Power and Water Contracts and Related Data with Introductory Notes, by Ray Lyman Wilbur, Secretary of the Interior and Nothcutt Ely, Assistant to the Secretary

United States. Department of the Interior

出版	U.S. Government Printing Office, 1933
URL	http://books.google.com.hk/books?id=W6lqzwEACAAJ&hl=&source=gbs_api