The minerals of Pennsylvania: Iron ores of Pennsylvania, by William O. Hickok, IV.

By: Material type: TextTextSeries: Bulletin M ; 18-BPublication details: Harrisburg, Pa., Department of Internal Affairs, Topographic and Geologic Survey, 1939.Description: 21 p. incl. tables. 23 cmSubject(s): LOC classification:
  • TN24.P4 A7
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At head of title: Pennsylvania Geological survey, Fourth series

With Ashley, G. H. The undeveloped mineral resources of Pennsylvania. 1933. (Bulletin M18-A)

Bibliographical footnotes.

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