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Kansan topography, showing mature topography developed by erosional loess overlying Kansan drift; Coralville, Iowa, late 1890s or early 1900s

Kansan topography, showing mature topography developed by erosional loess overlying Kansan drift; Coralville, Iowa, late 1890s or early 1900s

Located at Coralville, north of, S.W. 1/4 Section 32, T. 80 W. R..
Iowa River as a characteristic stream of the drift covered area, Old Capital Quarries, Iowa, late 1890s or early 1900s

Iowa River as a characteristic stream of the drift covered area, Old Capital Quarries, Iowa, late 1890s or early 1900s

Chart of general table of geologic divisions

Chart of general table of geologic divisions

Iowa Geological Section chart, late 1890s or early 1900s

Iowa Geological Section chart, late 1890s or early 1900s

Petrified forest south of Adamana, Ariz., late 1890s or early 1900s

Petrified forest south of Adamana, Ariz., late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s