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Court House on the Sioux River, Sioux Falls, S.D., late 1890s or early 1900s

Court House on the Sioux River, Sioux Falls, S.D., late 1890s or early 1900s

Cross-bedding in Sioux Quartzite, Sioux Falls, S.D., late 1890s or early 1900s

Cross-bedding in Sioux Quartzite, Sioux Falls, S.D., late 1890s or early 1900s

Gravel pit with stratification in gravels, east side of Afton Junction, Iowa, late 1890s or early 1900s

Gravel pit with stratification in gravels, east side of Afton Junction, Iowa, late 1890s or early 1900s

Dip of quartzite to the South of Court House, Sioux Falls, S.D., late 1890s or early 1800s

Dip of quartzite to the South of Court House, Sioux Falls, S.D., late 1890s or early 1800s

Chalk cliff near Old Grills Mill on Sioux River south of Westfield, Iowa, late 1890s or early 1900s

Chalk cliff near Old Grills Mill on Sioux River south of Westfield, Iowa, late 1890s or early 1900s

Atwood Quarry, Iowa, late 1890s or early 1900s

Atwood Quarry, Iowa, late 1890s or early 1900s

Weathered face of Galena Limestone near Walter's Furnace, Dubuque, Iowa, late 1890s or early 1900s

Weathered face of Galena Limestone near Walter's Furnace, Dubuque, Iowa, late 1890s or early 1900s

Walter's smelter, Dubuque, Iowa, late 1890s or early 1900s

Walter's smelter, Dubuque, Iowa, late 1890s or early 1900s

Top works of Platt Mine, Iowa, late 1890s or early 1900s

Top works of Platt Mine, Iowa, late 1890s or early 1900s

Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s

Geology Laboratory, north room, Old Science Hall, The University of Iowa, late 1890s or early 1900s