Ashley, Geo. H.  1866- <br/><br/>
A syllabus of Pennsylvania geology and mineral resources / 
by George H. Ashley. 
 - Harrisburg :  Department of internal affairs, Topographic and geologic survey,  1931. 
 - 160 p. incl. ill., maps, tables, diagrs. :  II pl. (fold. col. map, fold. tab.) ;  23 cm. 
 - Pennsylvania Geological survey, 4th (1919-   ) Bulletin G1 .
 - Bulletin G ;  1. .
<br/><br/> "Publications of the present [Pennsylvania] Geological survey": p. 147-150.  "Publications of the second Geological survey": p. 152-154.  "List of U. S. Geological survey publications on Pennsylvania": p. 155-158. 
<br/><br/><label>LCCN: </label>gs 31000177  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Pennsylvania.<br/>Mines and mineral resources--Pennsylvania.<br/>Geology--Pennsylvania--Bibliography.
<br/><br/><label>LC Class. No.: </label>QE157  / .A83 
<br/><br/><label>Gov. Doc. Class. No.: </label>PY G345/4.3 G1