Bituminous coal fields of Pennsylvania.
APA Citation
Pennsylvania. Bureau of Topographic and Geologic Survey., Reese, J. F., Sisler, J. D. (James Donaldson)., Ashley, G. H. (George Hall)., United States. Bureau of Mines. (1925). Bituminous coal fields of Pennsylvania. Harrisburg.
MLA Citation
United States. Bureau of Mines, et al.. Bituminous Coal Fields of Pennsylvania. Harrisburg, 1925.
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