Stone, Ralph W.  1876-1964. <br/><br/>
Mineral resources of the Elders ridge quadrangle, Pennsylvania / 
by Ralph W. Stone. 
 - Washington,  Govt. Print. Off.,  1905. 
 - 86, v p. :  ill., xii pl. (incl. fol. map in pocket) diagrs.;  24 cm. 
 - U.S. Geological survey. Bulletin  no. 256 .
 - Geological Survey (U.S.).  Bulletin ;  no. 256. .
<br/><br/> Subject series: A, Economic geology, 51; B, Descriptive geology, 63.  Includes index. 
<br/><br/><label>LCCN: </label>gs 05000908  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--Pennsylvania--Elders ridge quadrangle.<br/>Geology--Pennsylvania--Elders ridge quadrangle.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 256