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Men on railroad cars near Iowa Ballast and Construction Co., Maxon, Iowa, late 1890s or early 1900s

Men on railroad cars near Iowa Ballast and Construction Co., Maxon, Iowa, late 1890s or early 1900s

Loading out burned clay and ballast, Davis City, Iowa, September 1897

Loading out burned clay and ballast, Davis City, Iowa, September 1897

People near cabin at ballast burning camp, Maxon, Iowa, late 1890s or early 1900s

People near cabin at ballast burning camp, Maxon, Iowa, late 1890s or early 1900s

Dredge on Fraser River, Colorado, late 1890s or early 1900s

Dredge on Fraser River, Colorado, late 1890s or early 1900s

Left to right, Leverett, Calvin, Chamberlin, Bain, and Udden, Geologists' Conference, Peoria, late 1890s or early 1900s

Left to right, Leverett, Calvin, Chamberlin, Bain, and Udden, Geologists' Conference, Peoria, late 1890s or early 1900s

West wall of "Devil's Backbone" canyon, Dundee, Iowa, late 1890s or early 1900s

West wall of "Devil's Backbone" canyon, Dundee, Iowa, late 1890s or early 1900s

Old Science Hall, in old postition, from the southwest

Old Science Hall, in old postition, from the southwest

Old Science Hall on the University of Iowa campus, Iowa City. Photograph taken in fall.
Homeopathic Medical Hospital, Summer

Homeopathic Medical Hospital, Summer

Hospital, on corner of Jefferson and Dubuque Streets. University of Iowa campus, Iowa City
Cliffs, Clay Mill, Iowa, late 1890s or early 1900s

Cliffs, Clay Mill, Iowa, late 1890s or early 1900s

Photograph taken from Mill.
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 Niagara and flagstone beds of Syringopora tenella zones in the upper cliffs, Jefferson Township, Balltown, Iowa, late 1890s or early 1900s