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Waterfall, Mena, Ark., late 1890s or early 1900s

Carboniferous shale, Mena, Ark., late 1890s or early 1900s

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

Typical development of coal measures shale in the coal pit of Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s

Capitol City Brick and Pipe Company, Des Moines, Iowa, late 1890s or early 1900s

Big Fork Hotel and Post Office, Mena, Ark., late 1890s or early 1900s

Carboniferous, Mena, Ark., late 1890s or early 1900s

Carboniferous, Mena, Ark., late 1890s or early 1900s

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

Hill showing Carboniferous, Mena, Ark., late 1890s or early 1900s

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

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

Flint Brick Company clay pit, Des Moines, Iowa, late 1890s or early 1900s

Shale exposure east of Mena, Ark., late 1890s or early 1900s

Map of the surface deposits of Polk County, Iowa, 1897

Map of Polk County, Iowa, 1878

Iowa land survey map of t081n, r022w

Iowa land survey map of t079n, r025w

Iowa land survey map of t078n, r025w

Iowa land survey map of t079n, r023w

Iowa land survey map of t078n, r022w

Iowa land survey map of t080n, r025w

Iowa land survey map of t079n, r022w

Iowa land survey map of t080n, r022w

Iowa land survey map of t078n, r024w

Iowa land survey map of t081n, r023w

Iowa land survey map of t081n, r025w

Iowa land survey map of t080n, r023w

Iowa land survey map of t078n, r023w

Iowa land survey map of t079n, r024w

Iowa land survey map of t080n, r024w

Iowa land survey map of t081n, r024w

Polk County, Iowa, 1950, aerial photomosaic index

Polk County, Iowa, 1938, aerial photomosaic index

Polk County, Iowa, 1955, aerial photomosaic index

Polk County, Iowa, 1961, aerial photomosaic index

Polk County, Iowa, 1967, aerial photomosaic index

Polk County, Iowa, 1974, aerial photomosaic index

Polk County, Iowa, 1982, aerial photomosaic index

Polk County, Iowa, 1974, aerial photomosaic index

Plat book of Polk County, Iowa, 1930

Plat Book and Complete Survey of Polk County, Iowa, 1914

Atlas of Polk County, Iowa, 1902

Tate's atlas of Des Moines, Iowa, 1899

Des Moines, Iowa.

Des Moines, Iowa. CBQ

Commerce, Iowa. CNW

Elkhart, Iowa. CNW