Ochers and Mineral Pigments of the Pacific Northwest : Occurrence, Possible Methods of Preparation, and Testing of Ochers, Siennas, and Colored Clays

Author:	Wilson, Hewitt
Year:	1929
Document Type:	N/A
Series:	United States Bureau of Mines Reports
Report Number:	Bulletin 304
Link:	https://digital.library.unt.edu/ark:/67531/metadc12477/