Coal Resources of the United States

A Progress Report, November L, 1950

by Alfred E. Torrey, Frank A. Swenson, Geological Survey (U.S.). Topographic Division. Research and Technical Control Branch, George J. Edwards, Ivan D. Yost, Rolland William Carter, Roy Edwin Oltman, Paul Averitt, Hubert Jerome Tracy, Paul Livingston Applin, W. Kenneth Bach · 1949