Borel Powerhouse - Kern River 3rd stage - P. L. Caranci & N. A. Ryder making entrainment test on overflow dam concrete [Plus worker using mortar gun to repair rock pocket in downstream edge of one of the concrete piers - Overflow Dam. (#40040) on same photocard]
Southern California Edison Photographs and Negatives G. Haven Bishop (SCE) Southern California Edison Photographs and Negatives, Huntington Digital Library
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