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Down the Colorado

John Wesley PowellEliot Porter

出版	George Allen and Unwin, 1969
URL	http://books.google.com.hk/books?id=9SpUwgEACAAJ&hl=&source=gbs_api

註釋

One hundred years ago John Wesley Powell set out to explore the Grand Canyon of the Colorado - something no man had attempted before. His official report of the voyage remains one of the great adventure stories in all the literature of the American West.