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  • 3940
    P12-200-2929NA Klamath Project - Oregon-California. View of small crawler tractor being used to backfill the open trench. Excavated earth, windrowed along the open trench, provides the material needed ...
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  • 3946
    P12-200-2935NA Klamath Project - Oregon-California. View of motor patrol filling an open trench; December 1972; Bureau of Reclamation photo by D. W. Stein
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