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Now showing items 1-10 of 12
New Athens-Okawville folio, Illinois
(Geological Survey (United States), 1921)
Syracuse-Lakin folio, Kansas
(Geological Survey (United States), 1920)
Elkton-Wilmington folio ; Maryland-Delaware-New Jersey-Pennsylvania
(Geological Survey (United States), 1920)
Riddle folio, Oregon
(Geological Survey (United States), 1924)
Central Black Hills folio, South Dakota
(Geological Survey (United States), 1925)
Carlyle-Centralia folio, Illinois
(Geological Survey (United States), 1923)
Gillespie-Mount Olive folio, Illinois
(Geological Survey (United States), 1926)
Raton-Brilliant-Koehler folio, New Mexico-Colorado
(Geological Survey (United States), 1922)
Ray folio, Arizona
(Geological Survey (United States), 1923)
Bessemer-Vandiver folio, Alabama
(Geological Survey (United States), 1927)