1. Sample locality map and potassium-argon ages and data for Cenozoic igneous rocks in the Tonopah 1⁰?x 2⁰?quadrangle, central Nevada Yale Public content 1987. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Division. English. Public. Nevada.