Core Drilling at Shaft Sites of Proposed Mine-Water Drainage Tunnel: Anthracite Region of Pennsylvania

Author:	Ash, S. H. (Simon Harry), b. 1889
Additional Authors:	Miller, P. S., Doherty, R. Emmet, Romischer, W. M.
Year:	1952
Document Type:	N/A
Series:	United States Bureau of Mines Reports
Report Number:	Bulletin 513
Link:	https://digital.library.unt.edu/ark:/67531/metadc12672/