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Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s

Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s

Clay pit of Mason City Brick and Tile Company, Mason City, Iowa, late 1890s or early 1900s

Clay pit of Mason City Brick and Tile Company, Mason City, Iowa, late 1890s or early 1900s

Men in quarry in Devonian limestone, Cedar Valley Stage, Iowa City, Iowa, late 1890s or early 1900s

Men in quarry in Devonian limestone, Cedar Valley Stage, Iowa City, Iowa, late 1890s or early 1900s

Quarry in Devonian limestone, Cedar Valley Stage, showing two parallel joints, Iowa City, Iowa, late 1890s or early 1900s

Quarry in Devonian limestone, Cedar Valley Stage, showing two parallel joints, Iowa City, Iowa, late 1890s or early 1900s

Chicago, Milwaukee and St. Paul Railroad bridge, Fayette, Iowa, late 1890s or early 1900s

Chicago, Milwaukee and St. Paul Railroad bridge, Fayette, Iowa, late 1890s or early 1900s

Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s

Man at O'Toole Quarry, Independence, Iowa, late 1890s or early 1900s

Stratified clays in clay pit of Mason City Brick and Tile Works, Mason City, Iowa, late 1890s or early 1900s

Stratified clays in clay pit of Mason City Brick and Tile Works, Mason City, Iowa, late 1890s or early 1900s

Works of the Mason City Brick and Tile Company, from the southeast, Mason City, Iowa, late 1890s or early 1900s

Works of the Mason City Brick and Tile Company, from the southeast, Mason City, Iowa, late 1890s or early 1900s

Mouth of cave at Devil's Den, Iowa, late 1890s or early 1900s

Mouth of cave at Devil's Den, Iowa, late 1890s or early 1900s

Located in Twp. 99 R. 5 Section 19 N. W. gr., N. E, 1/4, N. E. corner.
Mount Hope, Union City Township, Iowa, late 1890s or early 1900s

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

Located north east 34, 100, 5.