The Square Buttes coal field, Oliver and Mercer Counties, North Dakota,
by William D. Johnson, Jr. and Robert P. Kunkel.
- Washington, U.S. Govt. Print. Off., 1959.
- v, 91 p. illus., maps (part fold. col.) profiles, tables. 24 cm.
Part of illustrative matter in pocket. "Prepared as part of a program of the Department of the Interior for development of the Missouri River Basin."