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

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

Buchanan gravels, vertical view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels, vertical view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s

The Sentinel and Sleeping Boulders, Newton Township, Iowa, late 1890s or early 1900s

The Sentinel and Sleeping Boulders, Newton Township, Iowa, late 1890s or early 1900s

Buchanan gravels with boulders of Iowan stage, Illinois Central Gravel Pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels with boulders of Iowan stage, Illinois Central Gravel Pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels, horizontal view, in the Illinois Central gravel pit, Independence, Iowa, late 1890s or early 1900s

Buchanan gravels, horizontal view, in the Illinois Central gravel pit, Independence, 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

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

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

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

Alpine Glaciers, late 1890s or early 1900s

Alpine Glaciers, 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