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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/28722/bk0012h9j9k/?order=1
Title:
Pardee Dam Construction, -- Showing cleaning of rock in river bed by use of jets of combined water and compressed air. Rocks were scoured with steel wire brooms and were hand cleaned.
Contributing Institution:
UC Berkeley, Bancroft Library