Ocher and Ochery Earths

Author:	Santmyers, R. M.
Year:	1929
Document Type:	N/A
Series:	United States Bureau of Mines Reports
Report Number:	Circular No. 6132
Subjects:	Ocher.
	Mineral industries -- France.
Link:	http://digital.library.unt.edu/ark:/67531/metadc100843/