1. Transcontinental geophysical survey (35°-39° N) seismic refraction profiles of the crust and upper mantle from 87° to 100° W longitude / [cartographic material] Yale Public content 1968. 2012-10-10T14:13:35Z. 2013-03-18T22:22:42Z. Warren, David H. U.S. Geological Survey. English. Public. Middle West and Great Plains.