The minerals of Pennsylvania: Non-metallic minerals, by R. W. Stone.
Material type:
TextSeries: Bulletin M ; 18-CPublication details: Harrisburg, Pa., Department of Internal Affairs, Topographic and Geologic Survey, 1939.Description: 50 p. incl. illus. (map) tables. 23 cmSubject(s): LOC classification: - TN24.P4 A7
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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