Ries, Heinrich,  1871-1951. <br/><br/>
The clays of the Piedmont Province, Virginia, 
by H. Ries and R. E. Somers. 
 - Charlottesville,  University of Virginia,  1917. 
 - vi, [2], 86 p.  XV pl. (incl. fold. map in pocket)  26 cm. 
 - Virginia. Geological survey. Bulletin  no. 13 .
<br/><br/><label>LCCN: </label>gs 17000415  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay--Virginia.
<br/><br/><label>LC Class. No.: </label>QE173  / .A2 no. 13