A syllabus of Pennsylvania geology and mineral resources Ashley, Geo. H. (George Hall) 1866- creator text pau Harrisburg Department of internal affairs, Topographic and geologic survey 1931 monographic eng
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160 p. incl. ill., maps, tables, diagrs. : II pl. (fold. col. map, fold. tab.) ; 23 cm. by George H. Ashley. "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. Geology Pennsylvania Mines and mineral resources Pennsylvania Geology Pennsylvania Bibliography QE157 .A83 PY G345/4.3 G1 PY G345/4.3 G1 Bulletin G ; 1 gs 31000177 DLC 750613 20260227111335.0 gs 31000177