Scope and Contents From the Collection: The Mary M. Marks photograph collection consists of approximately 301 glass plate negatives (with modern paper prints) and 24 prints without negatives. The images are from the Oro Grande Placer Mine and the Gold Pan Mining Company and include mining pits, dredges, flumes, and various other mining operations. Other images are of railroad depots and homes in Summit County Colorado (Breckenridge and Dillon), as well as the Snake River. Also included are photographs of Mary Marks's friends...