• 3 Wisconsin Historical Society Library

• 7 Mines and mineral resources
• 6 Petroleum
• 5 Geology
• 5 New Mexico. Bureau of Mines and Mineral Resources
• 2 Natural gas
• 1 Earth sciences
• 1 Geological time
• 1 Groundwater
• 1 Hydrology
• 1 Mineral industries
• 1 Mining corporations
• 1 Petroleum industry and trade
• 1 Quarries and quarrying
• 1 Radiocarbon dating
• 1 Water-supply

• 2 Lea County (N.M.). Operators Committee
• 1 Geological Survey (U.S.)
• 1 Nevada Bureau of Mines and Geology
• 1 New Mexico
• 1 New Mexico Institute of Mining and Technology
• 1 New Mexico. Bureau of Mine Inspection
• 1 New Mexico. Energy, Minerals, and Natural Resources Department
• 1 New Mexico. Mining and Minerals Division
• 1 New Mexico. Oil Conservation Commission

• 18 English

• 15 New Mexico

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