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Ledge of Trenton Limestone showing effects of weathering, late 1890s or early 1900s
Located at Twp. 96, R. W. Section 32, N. W. gr., N. W. 1/4.
Bluffs in driftless area showing characteristic distribution of timber sharply limited to northern and northeastern slopes, Iowa, late 1890s or early 1900s
Located in Twp. 100, R.V.section 15.
Chicago, Milwaukee and St. Paul Railroad bridge, Fayette, Iowa, late 1890s or early 1900s
Galena Limestone on the Oneota River, above Bluffton, Iowa, late 1890s or early 1900s
Fine quality of quarry stone with evenly bedded limestone about 40 feet above the Saint Croix, Iowa, late 1890s or early 1900s
Located in Twp. 100, R. V. Section 18, N. W. 1/4, N. E. corner.
Lower bluff beds, Specht's Ferry, Iowa, late 1890s or early 1900s
Bluff, Iowa, late 1890s or early 1900s
Located in Twp., 100, R.W. Section 14, N.W. gr., S. 1/2.
Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s
Located in the R.W. Section 16, S.W. gr., N.E. 1/4.
Cliff of Trenton Limestone on the Oneota River, Bluffton, Iowa, late 1890s or early 1900s
Cliff of Trenton Limestone in Cold Water Spring State Preserve, Bluffton, Iowa, late 1890s or early 1900s
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