Description:
Report issued by the U.S. Bureau of Mines regarding an investigation of the reserves of coking coal in Somerset County, Pennsylvania. The report includes tables and maps representing different coal beds within Somerset County.
Date:
August 1953
Creator:
Wallace, Joseph J.; Dowd, James J.; Bowsher, John A.; Abernethy, R. F. & Reynolds, D. A.
Description:
Report issued by the Bureau of Mines over the geology of roof-rock stability in coal mines. The distribution, frequency, and magnitude of roof falls in U.S. coal mines are discussed. This report includes maps, illustrations, and photographs.
Date:
1981
Creator:
Iannacchione, A. T.; Ulery, J. P.; Hyman, D. M. & Chase, F. E.
Description:
From Significance and value of Analyses of Coal: "The analyses published in this report cover samples of coal collected in many different parts of the country with unusual care by experiences men, in such manner as to make them representative of extensive beds of coal."
Description:
From Introduction: "This volume contains the descriptions of the samples whose analyses are published in the preceding volume, Part I of this bulletin. The descriptions have been compiled from the notebooks of the persons who collected the samples, have been condensed from accounts given in published reports of the United States Geological Survey, or have furnished by the collection themselves. Inasmuch as the descriptions represent the work of many persons during a period of six years, and ina…
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