TY  - BOOK
AU  - Brown,Amos P.
AU  - Ehrenfeld,Frederick
TI  - Minerals of Pennsylvania,
T2  - Pennsylvania. Topographic and Geologic Survey. Report
AV  - GA61.P4 A5 no. 9
PY  - 1913///
CY  - Harrisburg, Pa.
PB  - W. S. Ray
KW  - Mines and mineral resources
KW  - Pennsylvania
ER  -