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Collection: Calvin Geological Photographs
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Topographies of the typical Iowa Drift Plain and the dissected Kansan Drift Plain, south of Waterloo and northwest of Oxford Junction, Iowa, late 1890s or early 1900s
Topographic setting of the first Interurban cut (north of the Upper Interurban bridge) with folded and contorted Buchanan Gravels, Iowa City, Iowa, late 1890s or early 1900s
Iowa City
Topographic map of the Fairfax quadrangle, Iowa, late 1890s or early 1900s
Top works of Platt Mine, Iowa, late 1890s or early 1900s
Top picture: Dodgeville peneplain at an elevation of 1260 ft., Asbury, Iowa, 1920s. Bottom picture: Lancaster peneplain northeast of Waukon, Iowa, 1920s
Thinning of Devonian beds, Portland, Iowa, late 1890s or early 1900s
Thin bedding with dip northeast. Heavy beds at base of section containing Dinobolus conradi Hall and many casts of small individuals of Atrypa reticularis, Linne, Iowa, late 1890s or early 1900s
Thin bedded Niagara and flagstone beds of Syringopora tenella zones in the upper cliffs, Jefferson Township, Balltown, Iowa, late 1890s or early 1900s
Thin bedded and the heavy beds at base of section contain Dinobolus conradi Hall and numerous casts of Atrypa reticularis, Linne, Iowa, late 1890s or early 1900s
The winding way, Iowa City, Iowa, late 1890s or early 1900s
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