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US coal reserves : a review and update
1996
Persistent link: https://www.econbiz.de/10000618229
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State coal profiles
1994
Persistent link: https://www.econbiz.de/10000145660
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State coal profiles
1994
Persistent link: https://www.econbiz.de/10000426439
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Estimation of US coal reserves by coal type : heat and sulfur content
1989
Persistent link: https://www.econbiz.de/10000796301
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Natural resources inventory
Voss, Frithjof - 1979
Persistent link: https://www.econbiz.de/10003505976
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Natural resources inventory
Voss, Frithjof - 1983 - rev. ed.
Persistent link: https://www.econbiz.de/10014418518