Inset : [key map, state of Indiana]. Includes text: 'List of coal mining companies shipping by rail'; 'List of rail shipping mines in the state of Indiana.' Detail: [coal producing counties: Warren County, south to Ohio River]. Scale approximately 1:250,000. Compiled by Department of Geology, Indiana State Teachers College, under the auspices of Coal Trade Association of Indiana; Allison L. Vrydagh, cart.