Highway geology, Philadelphia to Pittsburgh
By: by Bradford Willard.
Series: Bulletin G,; 12
Publisher: Department of internal affairs, Topographic and geologic survey
Published: 1939
Place of publication: Harrisburg, Pa
Language: eng
Number of pages: 42
Subjects: Geology -- Pennsylvania.
Notes: "References":  p. 27-28.
At head of title: Pennsylvania Geological survey, Fourth series.
On cover: Commonwealth of Pennsylvania. Department of internal affairs.