AFC215-41_MS&T_ExtPub_SME2017_ Study_of_US_Coal_Mines_since_1994
A Study of U.S. Coal Mine Closures Since 1994 SME Preprint 2017 Annual Meeting, Denver, Colorado Missouri University of Science and Technology (Grant AFC215-41) Brinkman, J. L., Schafler, J. R., Johnson, C. E.