MULLENS, Thomas E. Geology of the Cuba City, new diggins, and Shullsburg Quadrangles, Wisconsin and Illinois / by Thomas E. Mullens. -- Washington : United States Government Printing Office, 1964 - P. 437-531 + map. -- (Geological Survey Bulletin ; 1123-H). Subjects--Topical Terms: GeologíaIllinoisWisconsin Universal Decimal Class. No.: 55(773+775)