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Construction worker walking around earthmoving machine during construction at Castaic Dam and Reservoir, Calif., 1970

Colorado River, with barges preparing for construction of Parker Dam, near Parker (Arizona), 1934

Los Angeles Park Commission president Mabel V. Socha and Chief Deputy District Attorney Robert Stewart with large map of Griffith Park, [Los Angeles?], [1933?]

Men with shovels clearing mud from a street after a catastrophic mudslide, La Crescenta-Montrose, 1934