Classification and tabling of difficult ores :
with particular attention to fluorspar /
by W.H. Coghill.
|Main Author:||Coghill, William Hawes, 1876-|
Washington, D.C. : U.S. Dept. of Commerce, Bureau of Mines : 1929.
"This report represents work done under a cooperative agreement between the Bureau of Mines, Department of Commerce, and the Missouri School of Mines and Metallurgy, University of Missouri" -t.p.
ii, 40 p. :
ill., plates ;
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