Series II. Unscanned rolls and documents, 1883-1997, contains 464 boxes, totaling approximately 360 cu. ft. Most rolls are mining and topographical maps, mechanical and architectural drawings, and photographs that have not been scanned. Some rolls may be duplicates, very similar to, or of the same mine/area as scanned maps in Series I and are noted when possible by identifying the CON digital file number (e.g. "similar to CON2501" or "see also CON153").