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Now showing items 71-80 of 198
Engineer Mountain folio, Colorado
(Geological Survey (United States), 1910)
Cottonwood Falls folio, Kansas
(Geological Survey (United States), 1904)
Beaver folio, Pennsylvania
(Geological Survey (United States), 1905)
Amity folio, Pennsylvania
(Geological Survey (United States), 1907)
Tolchester folio, Maryland
(Geological Survey (United States), 1917)
Foxburg-Clarion folio, Pennsylvania
(Geological Survey (United States), 1911)
Maynardville folio, Tennessese
(Geological Survey (United States), 1901)
Scotts Bluff folio, Nebraska
(Geological Survey (United States), 1903)
Johnstown folio, Pennsylvania
(Geological Survey (United States), 1910)
Danville folio, Illinois-Indiana
(Geological Survey (United States), 1900)