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Coal Colorado Analysis
1
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The occurrence of minor elements in ash of low-rank coal from Texas, Colorado, North Dakota and Sout


Deul, Maurice, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1956. 1956

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 Axe Federal Documents Online  I 19.3:1036-H    ---  Available
2
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Relation of the carbon/oxygen ratio in coal to igneous intrusions in the Somerset coal field, Colora


Dyni, John R., author.
[Reston, Va.] : United States Department of the Interior, Geological Survey, 1980. 1980

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 Axe Federal Documents Online  I 19.3:1477-A    ---  Available
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