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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/28722/bk0016v003s/?order=1

Title:

Hetch Hetchy [O'Shaughnessy] Dam construction: Incline drain of precast, porous concrete blocks, north abutment.

Date:

June 29, 1922

Contributing Institution:

UC Berkeley, Bancroft Library