The mineral production of Pennsylvania, 1911, 1913. 

 - Harrisburg, Pa.  [1912?-14?] 
 - 2 v.  24 cm. 
 - Its Report  no. 8, 11 .
 - Pennsylvania.  Bureau of Topographic and Geologic Survey.  Report ;  8, 11. .
<br/><br/><label>LCCN: </label>gs 15000720  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>GA61.P4  / A5