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  • 4033
    P-12-200-3025NA Klamath Project - Oregon-California. View of contractor's men and equipment drilling a drainage hole in spillway crest area. A #55 Chicago pneumatic drill was used for this work; July ...
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  • 4049
    P-12-200-3036NA Klamath Project - Oregon-California. View of contractor's men and equipment drilling lower drainage holes; July 1974; USBR photo by D. W. Stein
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