Material collected and created by Gerald F. Galloway including maps, field notes, correspondence, and other papers related to mining and the development of real property in Park County, Colorado, circa 1872-circa 1970. The bulk of material in the collection relates to gold, silver, lead, zinc, and uranium mines, as well as the companies responsible for mining operations. The collection also documents the infrastructure of Park County, including roads and water works in the county seat, Fairplay, and the statutory town of Alma, as well as the communities of Bailey, Como, Grant, Guffey, Hartsel, Jefferson, Lake George, and Shawnee. It also details changes in areas that became ghost towns, including Antero Junction, Buckskin Joe (also known as Laurette or Lauret), Garo, Howbert, and Tarryall. The collection documents the surveying work of Galloway, as well as his predecessors in the regions, including Fred C. Morse, Lee Hayes, Hiram Phillips, and William H. Powless.