Highway geology, Philadelphia to Pittsburgh, by Bradford Willard.

By: Material type: TextTextSeries: Bulletin G ; 12Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939.Description: 2 p.l., 42 p. illus., 2 maps (1 fold.) fold. tab. 23 cmSubject(s): LOC classification:
  • QE157 .W53
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At head of title: Pennsylvania Geological survey, Fourth series.

On cover: Commonwealth of Pennsylvania. Department of internal affairs.

"References": p. 27-28.

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