1. The Coal Reserves Database Program;R Bonskowski;Government Information Quarterly,1993
2. Scope of the Federal Coal Leasing Program;Land Bureau;U.S. Department of the Interior. Web,2010
3. National Rail Freight Infrastructure Capacity and Investment Study;M A Cambridge;US Laws. Justia, n.d. Web. 29,1977
4. Peak Coal;C Coffey;The Charleston Gazette. 13,2009