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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

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

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

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

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

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

Folded and fissured limestone, Brandon, Iowa, late 1890s or early 1900s

Folded and fissured limestone, Brandon, Iowa, late 1890s or early 1900s

Bluffs in driftless area showing characteristic distribution of timber sharply limited to northern and northeastern slopes, Iowa, late 1890s or early 1900s

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.

Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, Iowa, late 1890s or early 1900s

Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, Iowa, late 1890s or early 1900s

Located in Twp. 81, R. VII, Section 22

Mason City Brick and Tile Company seen from northeast, Mason City, Iowa, late 1890s or early 1900s

Mason City Brick and Tile Company seen from northeast, Mason City, Iowa, late 1890s or early 1900s

Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s

Patterson's Spring ravine cut in limestone and shales, Iowa, late 1890s or early 1900s