Geology of the Lewistown area, Fergus County, Montana [map] / by Louis S. Gardner ; Department of the Interior, United States Geological Survey ; prepared as part of the Department of the Interior program for the development of the Missouri River Basin
Relief shown by contours and spot heights. "Base map prepared from plane table triangulation, Bureau of Land Management plats, and aerial photographs." "Geology mapped in 1947 and 1948 by L.S. Gardner...."
Includes text with bibliography, map of Montana showing location of Lewistown area, composite columnar section, and 1 table.