1. Transcontinental geophysical survey (35°-39°N) geologic map from 100° to 112° W longitude / [cartographic material] Yale Public content 1968. 2012-10-10T14:22:43Z. 2013-03-18T22:22:42Z. Carlson, John E. (John Edward), 1919-. U.S. Geological Survey. English. Public. Great Plains and West (U.S.).