1. Geologic map of the Brooks Spring quadrangle, Humboldt County, Nevada [cartographic material] Yale Public content 1977. 2012-06-04T14:20:24Z. 2012-06-13T15:03:32Z. Marsh, Sherman P., 1935-. U.S. Geological Survey. English. Public. Nevada, Humboldt County, and U.S.