Maps. Oklahoma. Map of northern Le Flore County, Okla., showing geologic structure, coal beds, and natural gas fields, geology by M. M. Knechtel, assisted by W. J. Souder, Oct. 1942-Mar. 1943; preliminary map [with text] by Maxwell M. Knechtel. Scale 1 m.=1.3 in., scale 1:48,000.