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Joining to push the plunger setting off an explosion marking the start of construction on the New Melones Dam. From left, front row: State Sen. Stephen Teale of West Point; Rep. Harold T. Johnson of the 2nd, mountain-valley, District; Kenneth Holm, assistant secreary, water and power development, U.S. Department of Interior; Brig. Gen. Walter P. Lebar, director of civil works, U.S. Army Corps of Engineers; and Rep. John J. McFall of the 15th District. Back row: John Hertle, Stanislaus River Flood Control Association, chairman of the ground breaking committee, about to fire a flare; Robert Boles, chairman of the Calaveras County Board of Supervisors; and Ralph Thiel, vice chairman of the Tuolumne County Board of Supervisors.