Woolsey, Lester Hood,  1877- <br/><br/>
Economic geology of the Beaver Quadrangle, Pennsylvania  (southern Beaver and northwestern Allegheny counties) 
by Lester H. Woolsey. 
 - Washington :  Govt. print. off.,  1906. 
 - vi, 132, vi p. :  ill., viii pl. (part fold., incl. map in pocket) diagrs. ;  24 cm. 
<br/><br/> Subject series : A. Economic geology, 74.  B. Descriptive geology, 93.  Issued also as House doc. no. 834, 59th Cong., 2d session. 
<br/><br/><label>LCCN: </label>gs 07000554  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--Pennsylvania--Beaver County.<br/>Mines and mineral resources--Pennsylvania--Allegheny County.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no.286