Directions for Sampling Coal for Shipment or Delivery

Author:	Pope, George S.
Year:	1917
Document Type:	N/A
SUDOC:	I 28.7:133
Series:	Technical paper (United States. Bureau of Mines) ; 133
Subjects:	Coal.
	Coal -- Testing.
Link:	http://digital.library.unt.edu/ark:/67531/metadc66385/