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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

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

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

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

Wisconsin gravels, Peoria, Ill., 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

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

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

Field class near West Hill section, Muscatine, Iowa, June 1910

Field class near West Hill section, Muscatine, Iowa, June 1910

Moraine northwest of Swaledale, Iowa, late 1890s or early 1900s

Moraine northwest of Swaledale, Iowa, late 1890s or early 1900s

Folds, W. Va., late 1890s or early 1900s

Folds, W. Va., late 1890s or early 1900s

Moraine on Wisconsin Drift, Iowa, late 1890s or early 1900s

Moraine on Wisconsin Drift, Iowa, late 1890s or early 1900s

Horse and buggy next to large boulders, Iowa, late 1890s or early 1900s

Horse and buggy next to large boulders, Iowa, late 1890s or early 1900s