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Keywords from Image Description:
CALIFORNIA FISH AND GAME BIOLOGIST ON THE COLORADO RIVER REGULAR CHECKS ARE MADE OF RIVER'S TEMPERATURE OXYGEN... NARA . Scope and content General notes Local identifier DA Environmental Protection Agency NARAAuthor O'Rear Charles Photographer File CALIFORNIAFISHANDGAMEBIOLOGISTONTHECOLORADORIVERREGULARCHECKSAREMADEOFRIVER'STEMPERATURE