Preparation of reference materials for particle size analysis of sitts and clays / 
by B. M. Delaney and L. J. Schroder 
 - Washington, D.C. :  U.S. Govt. Printing Office,  1979 
 - 14 p. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay<br/>Clay minerals<br/>Ceramic materials
<br/><br/><label>Dewey Class. No.: </label>549.609794