by Arkansas. State Inspector of Coal Mines

1924

by Geological Survey of Arkansas, Arkansas Geological Survey

1929

by Geological Survey of Arkansas, David Dale Owen

1858

by Arkansas. Bureau of Mines, Manufacture and agriculture

1927

by Arkansas Geological Survey, George Casper Branner

1927

by Arkansas. Bureau of Mines, Manufactures, and Agriculture, George Casper Branner, Arkansas Geological Survey

1927

by Geological Survey of Arkansas

1894

by Geological Survey of Arkansas

1894

by Arkansas. Geological Survey, 1887-1893, Geological Survey of Arkansas

1893

by Arkansas. Geological Survey, 1887-1893

1887