Geology and coal resources of the coal-bearing rocks of Alabama /

Autor Culbertson, William Craven, 1919-
Vydáno 1964

Strippable lignite deposits, Slope and Bowman Counties North Dakota : a contribution to economic geology /

Autor Kepferle, Roy Clark, 1926-, Culbertson, William Craven, 1919-
Vydáno 1955