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Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s

Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s

New workings in quarry in Upper Coal Measures, Earlham, Iowa, late 1890s or early 1900s

New workings in quarry in Upper Coal Measures, Earlham, Iowa, late 1890s or early 1900s

Quarry in Upper Coal Measures, old workings showing separation of stone into ledges, Earlham, Iowa, late 1890s or early 1900s

Quarry in Upper Coal Measures, old workings showing separation of stone into ledges, Earlham, Iowa, late 1890s or early 1900s

Roberson's brick yard, Des Moines, Iowa, late 1890s or early 1900s

Roberson's brick yard, Des Moines, Iowa, late 1890s or early 1900s

Kilns and sheds of Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s

Kilns and sheds of Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s

Elk Cliff with Coal Measure Sandstone on Des Moines River, Rosseau, Iowa, late 1890s or early 1900s

Elk Cliff with Coal Measure Sandstone on Des Moines River, Rosseau, Iowa, late 1890s or early 1900s

Coal Measure Shale (middle of picture) resting in eroded channel in St. Louis sandstone (seen in lower corners of picture) on Cedar Creek, Bellefontaine, Iowa, late 1890s or early 1900s.

Coal Measure Shale (middle of picture) resting in eroded channel in St. Louis sandstone (seen in lower corners of picture) on Cedar Creek, Bellefontaine, Iowa, late 1890s or early 1900s.

Coal Measure Sandstone and shale at foot of Capitol Hill, Des Moines, Iowa, late 1890s or early 1900s

Coal Measure Sandstone and shale at foot of Capitol Hill, Des Moines, Iowa, late 1890s or early 1900s

American Mine, Evans, Iowa, late 1890s or early 1900s

American Mine, Evans, Iowa, late 1890s or early 1900s

Cross-bedding in St. Louis sandstone, Bellefontaine, Iowa, late 1890s or early 1900s

Cross-bedding in St. Louis sandstone, Bellefontaine, Iowa, late 1890s or early 1900s

Bellafontaine