Ries, Heinrich,  1871-1951. <br/><br/>
The clays and shales of Virginia west of the Blue ridge, 
by H. Ries and R. E. Somers. 
 - Charlottesville,  University of Virginia,  1920. 
 - vii, 3, 118 p.  illus., XIV pl. (incl. map in pocket) tables, diagrs.  26 cm. 
 - Virginia.  Geological survey.  Bulletin  no. 20 .
<br/><br/> At head of title: Virginia Geological survey.  University of Virginia.  Thomas Leonard Watson, director. 
<br/><br/><label>LCCN: </label>gs 21000073  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay--Virginia<br/>Shale
<br/><br/><label>LC Class. No.: </label>QE173  / .A2 no. 20 
<br/><br/><label>Dewey Class. No.: </label>557.55