The Pennsylvania geological survey; administrative report, by Geo. H. Ashley.

By: Contributor(s): Material type: TextTextPublication details: Harrisburg, Pa., Dept. of internal affairs, Topographic and geologic survey, 1931.Description: 38 p. illus. (map.) 23 cmDDC classification:
  • 557.48
LOC classification:
  • QE157 .A315
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At head of title: Pennsylvania geological survey, fourth series.

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