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HITCHHIKER WITH HIS DOG TRIPPER ON U.S. . U.S. CROSSES THE COLORADO RIVER AT TOPOCK NARA .tif Scope and content General notes Local identifier DA Environmental Protection Agency NARAAuthor O'Rear Charles Photographer File HITCHHIKERWITHHISDOG TRIPPER ONU CROSSESTHECOLORADORIVERATTOPOCKNARA tif tif File HITCHHIKERWITHHISDOG