1. Geologic map of the Hetch Hetchy Reservoir quadrangle, Yosemite National Park, California [cartographic material] Yale Public content 1973. 2012-04-13T14:22:47Z. 2012-04-16T15:57:08Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. California, Yosemite National Park, and Yosemite National Park (Calif.).