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The effects of geologic structure on topographic form within the driftless area. The gently undulating, lower slopes are underlain by Maquoketa Shale, the steep hills in the background are of the overlying Niagaran Limestone. Graf, Iowa, late 1890s or early 1900s
Located south from Lattner's, near Graf.
Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s
Located in section 20 of Graham Township.
Morainic knob, Carroll, Iowa, late 1890s or early 1900s
Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s
The effects of geologic structure on topographic form within the driftless area. The gently undulating, lower slopes are underlain by Maquoketa Shale, the steep hills in the background are of the overlying Niagaran Limestone. Graf, Iowa, late 1890s or early 1900s
Located south from Lattner's, near Graf.
Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s
Located in section 20 of Graham Township.
Morainic knob, Carroll, Iowa, late 1890s or early 1900s
Initial steps in the formation of gulches in loess, section 20, Graham Township, 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.
Steep headwater slopes of the tributaries of Buck Creek, Washington, Iowa, October 21, 1918
Located in Washington Twp. sections 9 and 10.
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