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Courtesy of Society of California Pioneers
http://www.oac.cdlib.org/ark:/13030/kt696nc5fj/?order=1
Title:
1716. Sutro Tunnel Shaft No. 2 -- With Shaft No. 3 in the distance.
Creator/Contributor:
Lawrence & Houseworth, publisher
Date:
1860/1870
Contributing Institution:
Society of California Pioneers