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Now showing items 31-40 of 109
Beaver folio, Pennsylvania
(Geological Survey (United States), 1905)
Amity folio, Pennsylvania
(Geological Survey (United States), 1907)
Maynardville folio, Tennessese
(Geological Survey (United States), 1901)
Scotts Bluff folio, Nebraska
(Geological Survey (United States), 1903)
Danville folio, Illinois-Indiana
(Geological Survey (United States), 1900)
Santa Cruz folio, California
(Geological Survey (United States), 1909)
Hartville folio, Wyoming
(Geological Survey (United States), 1903)
Ellensburg folio, Washington
(Geological Survey (United States), 1903)
De Smet folio, South Dakota
(Geological Survey (United States), 1904)
Ouray folio, Colorado
(Geological Survey (United States), 1907)