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Date of photo: 1969
Entrance Portal of the Sutro Tunnel.
Date Uploaded: August 10, 2013
Source Caption: Entrance Portal to Sutro Tunnel. Built to drain water out of the lower levels of the Comstock Mines at Virginia City. Operational in the late 1800's. Scanned from Kodak 126 instamatic negative.
View on Flickr: https://www.flickr.com/photos/58058190@N00/3368868181