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Courtesy of Society of California Pioneers
http://www.oac.cdlib.org/ark:/13030/kt1h4nc2b9/?order=1

Title:

1703. Mouth of Sutro Tunnel and Shaft No. 1 -- From Observatory Point.

Creator/Contributor:

Lawrence & Houseworth, publisher

Date:

1860/1870

Contributing Institution:

Society of California Pioneers