Abstract Collection, circa 1920-circa 1973, of Kiril Spiroff, professor at Michigan Technological University and long-time curator at the A.E. Seaman Mineral Museum, located in Houghton, Michigan. Includes correspondence and papers related to his career at Michigan Technological University as well as a memory book signed by students, former students and friends on the occasion of his retirement from teaching, cards and photographs. Also includes records of the Isle Royale Mining Company and records...