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The Story of Man at Grand Canyon

Johnson Donald Hughes

出版	Grand Canyon Natural History Association, 1967
URL	http://books.google.com.hk/books?id=cCGDGAAACAAJ&hl=&source=gbs_api

註釋

Story of men, come-and-gone and thoughts on those yet-to-come to the Grand Canyon from historican and ranger-naturalist Donald J. Hughes.