The undeveloped mineral resources of Pennsylvania / introduction by George H. Ashley.

By: Material type: TextTextSeries: Bulletin M ; 18-A.Publication details: Harrisburg, Pa. : Department of internal affairs, Topographic and geologic survey, 1933.Description: 16 p. : incl. tables ; 23 cmSubject(s): LOC classification:
  • TN24.P4 A7
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At head of title: Pennysylvania Geological survey, Fourth series.

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