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Group at base of bluff called "Devil's Backbone," Dundee, Iowa, late 1890s or early 1900s
Crew of men near lower quarry beds, east of Farley, Iowa, late 1890s or early 1900s
Fishermen in gorge of Oneota River gorge cut in Devonian limestone, Forreston, Iowa, late 1890s or early 1900s
Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s
Men in quarry in Devonian limestone, Cedar Valley Stage, Iowa City, Iowa, late 1890s or early 1900s
Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s
Man in front of section of Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Located west of Graf.
It's genetic
It's genetic
Catalog card with marker drawing.
Man next to large Wisconsin boulder near the mouth of Prairie Creek, Iowa, late 1890s or early 1900s
A.C. Trowbridge, Professor of Geology, The University of Iowa, late 1890s or early 1900s
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