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The collection is organized into 12 series:

Series I. Mine Maps, 1917-1994

Series II. Company Property Maps, 1880-1989

Series III. Geographic Maps, 1910-1985

Series IV. Technical Drawings, 1906-1981

Series V. Aerial Photograph Maps, 1972-1990

Series VI. Hardback Maps, 1882-1978

Series VII. General Records, 1919-1987

Series VIII. Publications, 1884-1973

Series IX. Accident Reports, 1923-1964

Series X. Survey Books, 1913-1994

Series XI. Traverse Logs, 1913-1994

Series XII. Photographs, 1939-1947