Mining of Thin Coal Beds in the Anthracite Region of Pennsylvania

Author:	Ashmead, Dever C.
Year:	1927
Document Type:	N/A
Series:	United States Bureau of Mines Reports
Report Number:	Bulletin 245
Subjects:	Anthracite coal -- Pennsylvania.
	Coal mines and mining -- Pennsylvania.
Link:	https://digital.library.unt.edu/ark:/67531/metadc38763/