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Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s

Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s

Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s

Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s

Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s

Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s

Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s

Exposure of Carboniferous sandstone west of Robert's Ferry bridge, Iowa, late 1890s or early 1900s

Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s

Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s

Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s

Coral reef at Robert's Ferry bridge near where the Interurban Line crosses the Iowa River, Iowa, late 1890s or early 1900s

Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.

Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.

Located 1/4 mile south of Black Springs.

Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.

Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.

Located 1/4 mile south of Black Springs.

Botanical Laboratory, south room, Old Science Hall

Botanical Laboratory, south room, Old Science Hall

Old Science Hall on the University of Iowa campus, Iowa City

Botanical Laboratory, south room, Old Science Hall

Botanical Laboratory, south room, Old Science Hall

Old Science Hall on the University of Iowa campus, Iowa City

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