Ries, H.  1871-1951 <br/><br/>
Elementary economic geology / 
by H. Ries 
 - New York :  John Wiley,  1930 
 - vii, 360 p. :  ill., double map, diagrs. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Economic<br/>Mines and mineral resources