1938 official road map, North Dakota, South Dakota / [prepared for] Phillips Petroleum Company.H.M. Gousha Company[1938]"365-J C" and "L-1.""Phillips Petroleum Company official road map, United States" (scale [ca. 1:10,137,600]), road map of "Black Hills region, South Dakota," 4 local route maps, text, and ill. on verso.Indexed.Relief shown by hachures.cartographic