Sewickley folio, Pennsylvania
Author(s)
Bibliographic Information
Sewickley folio, Pennsylvania
(Geologic atlas of the United States, no. 176)
U.S. Geological Survey, 1911
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Note
NOTE: MAP:Scale 1:62,50 (W 80[0]--W 80[0]15'/N 40[0]30'--N 40[0]45'
Title from cover
At head of title: Department of the Interiour, United States Geological Survey, George Otis Smith, director