Partial map of California showing the early transmission line corridors belonging to Pacific Light and Power, Pacific Gas & Electric, Southern California Edison, Southern Sierras Power Co., San Joaquin Light & Power, Sierra & San Francisco Power and Western States Gas & Electric. No number originally assigned by Cal. Electric and - no documentation included.
Southern California Edison Photographs and Negatives California Electric Power (CEP) Southern California Edison Photographs and Negatives, Huntington Digital Library
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