Utilization of humus-rich forest soil (mull) in geochemical exploration for gold, 
by Gary C. Curtin [and others] 
 - Washington  [U.S. Govt. Print. Off.]  1968. 
 - iii, 11 p.  illus., maps.  26 cm. 
<br/><br/>Bibliography: p. 4. 
<br/><br/><label>LCCN: </label>gs 68000239 //r852 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geochemical prospecting.<br/>Gold ores--Colorado--Empire region.
<br/><br/><label>LC Class. No.: </label>QE75  / .C5 no. 562 
<br/><br/><label>Dewey Class. No.: </label>622/.18/41