Brown, Amos P.  1864-1917. <br/><br/>
Minerals of Pennsylvania, 
by Amos P. Brown and Frederick Ehrenfeld. 
 - Harrisburg, Pa.,  W. S. Ray,  1913. 
 - 160 p.  plates, maps (part fold.)  24 cm. 
 - Pennsylvania. Topographic and Geologic Survey. Report  no. 9 .
<br/><br/><label>LCCN: </label>gs 15000098  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>GA61.P4  / A5 no. 9