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Bluff, Waukon Junction, Iowa, late 1890s or early 1900s

"The Elephant" formed by Saint Croix sandstone covered by Oneota limestone, French Creek, Iowa, 1890s

Effects of weathering on a bluff of Trenton Limestone, Postville, Iowa, late 1890s or early 1900s

Mount Hope, Union City Township, Iowa, late 1890s or early 1900s

Yellow River and bluff below Buckland, Iowa, late 1890s or early 1900s

Terrace of Wisconsin age near Lansing, Iowa, late 1890s or early 1900s

Mississippi Bluff with Saint Croix at base (300 ft.) and 100 feet Oneota above, Lansing, Iowa, late 1890s or early 1900s

Yellow River cutting through Prairie du Chien Limestone, Ion, Iowa, 1890s

Old green shales bed of the Lower Trenton with natural size Orthis Dlamanella,subeauata, con. and Orthis Tricenaria con, Waukon, Iowa, late 1890s or early 1900s

Flood waters carried boulders to where wash of hill emerges on small plain, Dorchester, Iowa, late 1890s or early 1900s

Top picture: Dodgeville peneplain at an elevation of 1260 ft., Asbury, Iowa, 1920s. Bottom picture: Lancaster peneplain northeast of Waukon, Iowa, 1920s

Overlying Saint Croix sandstone, fold and dip shows beyond Bridge, dark line above railway marking the base of the Oneota, Quandahl, Iowa, late 1890s or early 1900s

Bluff of Oneota Limestone, Waterville, Iowa, late 1890s or early 1900s

Profile of Painted Rock, Waukon Junction, Iowa, late 1890s or early 1900s

North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, Iowa, late 1890s or early 1900s

Iron mine, Waukon, Iowa, 1890s

Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s

Waukon Sphinx left by unequal weathering, Waukon, Iowa, late 1890s or early 1900s

Residence of Governor Wm. Larrabee, Iowa, late 1890s or early 1900s

Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s

Iowa land survey map of t099n, r006w

Iowa land survey map of t099n, r005w

Iowa land survey map of t099n, r004w

Iowa land survey map of t098n, r003w

Iowa land survey map of t099n, r003w

Iowa land survey map of t098n, r002w

Iowa land survey map of t096n, r006w

Iowa land survey map of t096n, r004w

Iowa land survey map of t097n, r002w

Iowa land survey map of t098n, r006w

Iowa land survey map of t097n, r003w

Iowa land survey map of t097n, r004w

Iowa land survey map of t098n, r005w

Iowa land survey map of t096n, r005w

Iowa land survey map of t098n, r004w

Iowa land survey map of t097n, r005w

Iowa land survey map of t097n, r006w

Iowa land survey map of t100n, r005w

Iowa land survey map of t100n, r003w

Iowa land survey map of t100n, r006w

Iowa land survey map of t096n, r003w

Iowa land survey map of t100n, r004w

Allamakee County, Iowa, 1940, aerial photomosaic index

Allamakee County, Iowa, 1952, aerial photomosaic index

Allamakee County, Iowa, 1938, aerial photomosaic index

Allamakee County, Iowa, 1957, aerial photomosaic index

Allamakee County, Iowa, 1964, aerial photomosaic index

Allamakee County, Iowa, 1971, aerial photomosaic index