Search Results - (((("Coal verification.") OR ((("Coal classifications.") OR ("Coal classification."))))) OR ("Coal justification."))*
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The international systems of hard-coal classification and their application to American coals
Published: U.S. Dept. of the Interior, Bureau of Mines : For sale by the Supt. of Docs., U.S. G.P.O., 1958Description: iii, 19 pages : illustrations ; 26 cm.Government Document Book -
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Coal data
Published: U.S. Department of the Interior, Bureau of Land Management, Portland Service Center, 1970Get full textDescription: 1 online resource (2 pages) : illustrations.
Government Document eBook