TY  - BOOK
AU  - Ashley,GeoH.
TI  - A syllabus of Pennsylvania geology and mineral resources
T2  - Pennsylvania Geological survey, 4th (1919-   ) Bulletin G1
AV  - QE157 .A83
PY  - 1931///
CY  - Harrisburg
PB  - Department of internal affairs, Topographic and geologic survey
KW  - Geology
KW  - Pennsylvania
KW  - Mines and mineral resources
KW  - Bibliography
N1  - "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
ER  -