Coal resources of Illinois. Colchester (No. 2), Dekoven, and Jamestown coals [cartographic material] : with Belle Rive, Bristol Hill, Calhoun, Friendsville, Loudon, Oconee, Opdyke, Shelbyville, and Trowbridge coals / compiled by Janis D. Treworgy and Margaret H. Bargh ; drafted by Kate Hunter. Raster Massachusetts Institute of Technology Public content

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