Pennsylvania geology summarized

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Bibliographic Details
Main Author: Willard, Bradford, 1894-1973.
Format: Book
Language:English
Published: [Harrisburg : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey, 1962]
Series:Educational series ; no.4
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Item Description: "Originally published by the Pennsylvania Geological Survey in 1935 as Progress Report 113."
Geologic map of Pennsylvania (col.) inserted after p. 8.
Physical Description: 17 p. : ill., maps ; 23 cm.