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West Hill section, Muscatine, Iowa, late 1890s or early 1900s

West Hill section, Muscatine, Iowa, late 1890s or early 1900s

Railway cut showing Aftonian soil and plant bed between Pre-Kansan and Kansan drift, Tama County, Iowa, late 1890s or early 1900s

Railway cut showing Aftonian soil and plant bed between Pre-Kansan and Kansan drift, Tama County, Iowa, late 1890s or early 1900s

Wisconsin gravels, Peoria, Ill., late 1890s or early 1900s

Wisconsin gravels, Peoria, Ill., late 1890s or early 1900s

Wisconsin gravel pit, Peoria, Ill., late 1890s or early 1900s

Wisconsin gravel pit, Peoria, Ill., late 1890s or early 1900s

Loess and Kansan topography west of Belle Plaine, Iowa, late 1890s or early 1900s

Loess and Kansan topography west of Belle Plaine, Iowa, late 1890s or early 1900s

Boulders from the marginal moraine of the Wisconsin Drift Sheet, Clear Lake, Iowa, late 1890s or early 1900s

Boulders from the marginal moraine of the Wisconsin Drift Sheet, Clear Lake, Iowa, late 1890s or early 1900s

Beds, Peoria, Ill., late 1890s or early 1900s

Beds, Peoria, Ill., late 1890s or early 1900s

Located east of Peoria, Ill.

Sand Pit at the upper Palisades, Mount Vernon, Iowa, late 1890s or early 1900s

Sand Pit at the upper Palisades, Mount Vernon, Iowa, late 1890s or early 1900s

Buchanan Gravels, Earlville, Iowa, late 1890s or early 1900s

Buchanan Gravels, Earlville, Iowa, late 1890s or early 1900s

Glacial markings, Burlington, Iowa, late 1890s or early 1900s

Glacial markings, Burlington, Iowa, late 1890s or early 1900s