A photographic album documenting the controversial construction of the dam at Hetch Hetchy in Yosemite Valley.

William Clark was a railroad signalman in California in the early part of the 20th century.

1 item Brown leather photo album stamped "San Francisco" on the front and bound with ties. Affixed to the front pastedown of the album is Clark's signalman card. Most of the photographs measure 4 x 3 inches and are pasted on black paper album leaves, with some few affixed with photo corners.

All applicable copyrights for the collection are protected under chapter 17 of the U.S. Copyright Code. Requests for permission to publish or quote from manuscripts must be submitted in writing to the Head of Special Collections. Permission for publication is given on behalf of the Regents of the University of California as the owner of the physical items. It is not intended to include or imply permission of the copyright holder, which must also be obtained by the researcher.

Collection is open for research.