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Deposition in Cedar River at Upper Palisades, Iowa, late 1890s or early 1900s

Deposition in Cedar River at Upper Palisades, Iowa, late 1890s or early 1900s

Glacial planing west of Iowa City on Clear Creek near the old woolen mill, Iowa City, Iowa, late 1890s or early 1900s

Glacial planing west of Iowa City on Clear Creek near the old woolen mill, Iowa City, Iowa, late 1890s or early 1900s

Typical landscape in region covered with deep loess, near border of Iowan Drifts, Graham Township, Iowa, late 1890s or early 1900s

Typical landscape in region covered with deep loess, near border of Iowan Drifts, Graham Township, Iowa, late 1890s or early 1900s

Glacial scorings, Kingston, Iowa, late 1890s or early 1900s

Glacial scorings, Kingston, Iowa, late 1890s or early 1900s

Moraine, Iowa, late 1890s or early 1900s

Moraine, Iowa, late 1890s or early 1900s

Effects of expansion of ice along margin of Clear Lake, Clear Lake, Iowa, late 1890s or early 1900s

Effects of expansion of ice along margin of Clear Lake, Clear Lake, Iowa, late 1890s or early 1900s

Alpine Glaciers, late 1890s or early 1900s

Alpine Glaciers, late 1890s or early 1900s

Stratified silt below Illinoian Drift, Muscatine, Iowa, late 1890s or early 1900s

Stratified silt below Illinoian Drift, Muscatine, Iowa, late 1890s or early 1900s

Man next to large Wisconsin boulder near the mouth of Prairie Creek, Iowa, late 1890s or early 1900s

Man next to large Wisconsin boulder near the mouth of Prairie Creek, Iowa, late 1890s or early 1900s

Iowan boulders overlying Buchanan Gravels, Independence, Iowa, late 1890s or early 1900s

Iowan boulders overlying Buchanan Gravels, Independence, Iowa, late 1890s or early 1900s