Sample size and meaningful gold analysis / 
by H. Edward Clifton...[et al.]. 
 -- Washington :   United States Government Printing Office,   1969 
 - 17 p. -- 
 (Geological Survey Professional Paper  ;  625-C).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minerales<br/>Oro - Análisis
<br/><br/><label>Universal Decimal Class. No.: </label>549.283