Analyses of the coals of Ohio - Bownocker, J. A. (John Adams), 1865-1928.; Dean, Ethel S. (Ethel Sourbray); Ray, Franklin A. (Franklin Arnold), 1862-1938. (Columbus, Ohio : Geological Survey of Ohio, 1929)
Ohio coal supply and its exhaustion / Frank A. Ray.
Some maps are folded.
Includes index.
Keywords: Coal -- Ohio