TY  - BOOK
AU  - Willard,Bradford
TI  - Highway geology, Philadelphia to Pittsburgh,
AV  - QE157 .W53
PY  - 1939///
CY  - Harrisburg, Pa.
PB  - Department of internal affairs, Topographic and geologic survey
KW  - Geology
KW  - Pennsylvania
N1  - At head of title: Pennsylvania Geological survey, Fourth series; On cover: Commonwealth of Pennsylvania. Department of internal affairs; "References":  p. 27-28
ER  -