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Collection: Calvin Geological Photographs
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Ssection through upper part materials in the north valley wall of Helman sand pit. Shows gradation from Iowan aquenous and and silt upward into loess., Iowa City, Iowa, late 1890s or early 1900s
Iowa City, one mile north of, Helman Sand Pit
St. Louis Limestone east of Harvey, Iowa, late 1890s or early 1900s
Steam Laboratory
University of Iowa Campus, Iowa City
Steam Laboratory
University of Iowa Campus, Iowa City
Steamboat Rock at "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
Steep headwater slopes of the tributaries of Buck Creek, Washington, Iowa, October 21, 1918
Located in Washington Twp. sections 9 and 10.
Stratified clays in clay pit of Mason City Brick and Tile Works, Mason City, Iowa, late 1890s or early 1900s
Stratified silt below Illinoian Drift, Muscatine, Iowa, late 1890s or early 1900s
Stream in Boulder Creek Canyon, Colo., late 1890s or early 1900s
Summit of Table Mound in driftless area, Dubuque, Iowa, late 1890s or early 1900s
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