Barrier Pillars in Lackawanna Basin, Northern Field: Anthracite Region of Pennsylvania

Author:	Ash, S. H. (Simon Harry), b. 1889
Additional Authors:	Davies, B. S., Jenkins, H. E.
Year:	1952
Document Type:	N/A
Series:	United States Bureau of Mines Reports
Report Number:	Bulletin 517
Link:	https://digital.library.unt.edu/ark:/67531/metadc12675/