TY  - BOOK
AU  - Ashley,GeoH.
ED  - Pennsylvania.
TI  - The Pennsylvania geological survey: administrative report,
AV  - QE157 .A315
U1  - 557.48 
PY  - 1931///
CY  - Harrisburg, Pa.
PB  - Dept. of internal affairs, Topographic and geologic survey
N1  - At head of title: Pennsylvania geological survey, fourth series
ER  -