Principles of a resource/reserve classification for minerals /

Bibliographic Details
Corporate Authors:	United States. Bureau of Mines, Geological Survey (U.S.)
Format:	Government Document Book
Language:	English
Published:	[Reston, Va.] : The Survey, 1980.
Series:	Geological Survey circular ; 831.
Subjects:	Mines and mineral resources > United States > Classification.

Description
Item Description:	"A revision of the classification system published as U.S. Geological Survey Bulletin 1450-A."
Physical Description:	iii, 5 pages : 2 illustrations ; 26 cm.