"The use of mineral coal dates back before the Christian Era.
The mining of coal, however, is much more recent.
About the 18th century coal mining began to be scientifically executed.
The area of Anthracite coal fields in Penn. is not quite 500 square miles included in outcrop lines of its lowest beds"--page 1.
B.S. in Mining Engineering
Missouri School of Mines and Metallurgy
© 1899 A. D. Terrell, All rights reserved.
Thesis - Open Access
Coal mines and mining -- Pennsylvania
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Link to Catalog Record
Terrell, Arthur D., "Pennsylvania coal fields" (1899). Bachelors Theses. 364.