Droes, S. R. <br/><br/>
Leaching of pyroxmangite ore with calcium fluoride and sulfuric acid / 
by S.R. Droes, K.P.V. Lei, and T.G. Carnahan. 
 - Washington, DC :  Bureau of Mines, U.S. Dept. of the Interior,  1990. 
 - 8 p. 
 - Report of investigations / Bureau of Mines, United States Department of the Interior .
 - Report of investigations (United States. Bureau of Mines) .
<br/><br/><label>LCCN: </label>90001949  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Manganese--Metallurgy.<br/>Pyroxmangite.<br/>Leaching.<br/>Sulphuric acid.