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26
Crown mine (Superior, Colo.) printed materials 1936-1953
27
Municipal Government Reference Collection: Mines and mineral industries.
28
Groups at mines
29
Revenge Development Company Prospectus 1903
30
Boulder County (Colo.) mines and mining
31
Burning Coal Mine
33
Boulder Home Mining Company Leaflet [1928]
34
Curie Springs (Springdale, Colo.) printed materials [1951-1966]
35
Municipal Government Reference Collection: Environmental protection.
36
Mining claim location certificates 1906-1913
37
Incoming correspondence (from within Colorado), M-Z 1871-1879
38
Billings family papers 1841-[1919]
39
Tungsten mining companies (Boulder County, Colo.) printed materials 1906-[ca. 1909]
40
Boulder County (Colo.) mines and mining
41
Boulder County Colorado mining
42
Tungsten Production Company Printed materials [191-]
43
Boulder County (Colo.) mines and mining
45
Unidentified mine (Boulder County, Colo.)
46
Edward F. Yates family collection
47
New York Union Gold Mining Company prospectus 1902 Jan
48
Wolf Tongue Mining Company general manager's annual reports 1942-1944
49
County ledger
50
G. Cecil Brierley photograph collection [1910-1919]

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