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Institution
Format
Subject
15
Mines and mineral resources
10
Industrial minerals
6
Mineral industries
4
Fossil fuels
3
Gas fields
3
Oil fields
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2
Concessions
2
Gas reservoirs
1
Coal mines and mining
1
Geology, Structural
1
Geothermal resources
1
Land trusts
1
Natural gas reserves
1
Natural gas reserves Geology
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Author
Language
Literary Form
Region
Colorado
2
Garfield County
2
Gunnison County
2
Moffat County
1
Boulder County
1
Chaffee County
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1
Cheyenne County
1
Clear Creek County
1
Gilpin County
1
Grand County
1
Jefferson County
1
Kit Carson County
1
Lake County
1
Pitkin County
1
Saguache County
1
Sedgwick County
1
Summit County
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Year of Publication