Middleton, Jefferson <br/><br/>
Fuller's earth in 1922. 

 - Washington, D.C.  Government Printing Office  1923 
 - pp. 69-71 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA