Sheppard, Richard A. <br/><br/>
Clinoptilolite of Possible Economic Value in Sedimentary Deposits of the Conterminous United States / 
By Richard A. Sheppard. 
 -- Washington :   United States Government Printing Office,   1971 
 - 15 p. -- 
 (Geological Survey Bulletin  ;  1332-B).
<br/><br/> Fecha real de registro 9-8-1971 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clinoptilolite<br/>Estado Unidos de América<br/>Zenolita
<br/><br/><label>Universal Decimal Class. No.: </label>553(73)