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Now showing items 21-30 of 40
Warren folio, Pennsylvania-New York
(Geological Survey (United States), 1910)
Deming folio, New Mexico
(Geological Survey (United States), 1917)
Colorado Springs folio, Colorado
(Geological Survey (United States), 1916)
Galena-Elizabeth folio, Illinois-Iowa
(Geological Survey (United States), 1916)
Silver City folio, New Mexico
(Geological Survey (United States), 1916)
Leavenworth-Smithville folio, Missouri-Kansas
(Geological Survey (United States), 1917)
Kenova folio, Kentucky-West Virginia-Ohio
(Geological Survey (United States), 1912)
Belleville-Breese folio, Illinois
(Geological Survey (United States), 1915)
Philipsburg folio, Montana
(Geological Survey (United States), 1915)
Burgettstown-Carnegie folio, Pennsylvania
(Geological Survey (United States), 1911)