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Now showing items 21-30 of 109
Alexandria folio, South Dakota
(Geological Survey (United States), 1903)
Mount Mitchell folio, North Carolina-Tennessee
(Geological Survey (United States), 1905)
Washington folio, District of Columbia-Maryland-Virginia
(Geological Survey (United States), 1901)
Penobscot Bay folio, Maine
(Geological Survey (United States), 1907)
Pisgah folio, North Carolina-South Carolina
(Geological Survey (United States), 1907)
Mercersburg-Chambersburg folio, Pennsylvania
(Geological Survey (United States), 1909)
Needle mountains folio, Colorado
(Geological Survey (United States), 1905)
Bisbee folio, Arizona
(Geological Survey (United States), 1904)
Ditney folio, Indiana
(Geological Survey (United States), 1902)
Cottonwood Falls folio, Kansas
(Geological Survey (United States), 1904)