Unwatering flooded coal mines in Washington

Author:	Ash, S. H.
Additional Authors:	Murphy, Thomas,
Year:	1933
Document Type:	USBM
Issuing Agency:	U.S.Bureau of Mines,
SUDOC:	C 22.5:549
Series:	Technical paper / United States. Bureau of Mines ;
Report Number:	549
Subjects:	Coal mines and mining--Washington (State)
	Mine drainage
Link:	https://hdl.handle.net/2027/mdp.39015077565318