Media collection, circa 1954-circa 1961, of the Calumet and Hecla Mining Company. Includes audio and moving image recordings documenting copper mining and manufacturing, the Osceola unwatering project, union/labor relations, community events, safety awareness and work procedures, and agriculture.

Collection, 1954-after 1982, of manuscripts based on civilian diver Carl Peterson's account of his participation in the Osceola Mine Dewatering Project. Also included are copies of photographs of the project and an article "Unwatering the Osceola Lode" (Kramer, A.S. et al. Reprinted from Mining Engineering, April 1956).