"Prepared in cooperation with the Wisconsin Geological and Natural History Survey, the Illinois State Geological Survey, and the Iowa Geological Survey.
Information on Illinois furnished by H.B. Willman and R.R. Reynolds.
With:
Bound With: Strippable lignite deposits, Slope and Bowman Counties, North Dakota / by Roy C. Kepferle and William C. Culbertson.
Bibliography
Includes bibliographical references (p. 242-243) and index.
