Author: United States. Bureau of Mines Publisher: ISBN: Category : Bituminous coal Languages : en Pages : 28
Book Description
Bituminous coal and lignite seams of the United States and Alaska range from less than 2 feet in thickness to more than 50 feet, but the majority of the Nation's coal mines produce from seams 3 to 6 feet thick and the average of the country is 65 inches. Contains information on coal seams of the United States as well as other data on coal production from strip and underground bituminous coal and lignite mines 1945.
Author: United States. Bureau of Mines
Author: W. H. Young
Author: W. H. Young
Author: W. H. Young
Author: W.H. Young
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Author: 
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Author: United States. Bureau of Mines. Division of Bituminous Coal
Author: United States. Bureau of Mines