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Now showing items 1-6 of 6
Foxburg-Clarion folio, Pennsylvania
(Geological Survey (United States), 1911)
Galena-Elizabeth folio, Illinois-Iowa
(Geological Survey (United States), 1916)
Belleville-Breese folio, Illinois
(Geological Survey (United States), 1915)
Burgettstown-Carnegie folio, Pennsylvania
(Geological Survey (United States), 1911)
Murphysboro-Herrin folio, Illinois
(Geological Survey (United States), 1912)
Tallula-Springfield folio, Illinois
(Geological Survey (United States), 1913)