Lignite resources of North Dakota.
- Washington, 1953.
- v, 78 p. illus., maps (1 fold. col.) diagrs., tables. 27 cm.
- Geological Survey circular 226 .
- United States. Geological Survey. Circular ; 226. .
Prepared with the cooperation of the North Dakota Geological Survey and the North Dakota Research Foundation as part of a program of the Dept. of the Interior for the development of the Missouri River Basin.