A thick coal bed near Lake De Smet, Johnson County, Wyoming - Mapel, W. J. (William Jameson), 1922- (Washington, 1953)
Part of illustrative matter is folded in pocket.
"Correction" slip inserted, p. iii.
Bibliographical footnotes.
Keywords: Coal -- Wyoming -- Johnson County; Geology -- Wyoming -- Johnson County; Borings -- Wyoming -- Johnson County