Smith, R. Craig. <br/><br/>
Preval :  prefeasibility software program for evaluating mineral properties / 
R. Craig Smith. 
 - Washington, D.C. :  U.S. Dept. of the Interior,  1992. 
 - 35 p. 
 - Information circular / Bureau of mines, U.S. Dept. of the Interior ;  9307 .
 - Information circular (United States.  9307 .
<br/><br/><label>LCCN: </label>91048033  
<br/><br/><label>Subjects--Topical Terms: </label><br/>PREVAL (Computer programme).<br/>Mine valuation--Computer programmes.