open access Radioactivity of Asphaltites, Coals, and Shales in Tennessee, Kentucky, West Virginia, and Pennsylvania Description: Report discussing the U.S. Geological Survey's investigation of the radioactivity measurements of asphalltites, coals and shales found in Tennessee, Kentucky, West Virginia, and Pennsylvania. Date: October 1948 Creator: Nelson, J. M. & Brill, K. G., Jr.