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2. Diamond, W.P., Levine, J.R., 1981. Direct method determination of the gas content of coal: procedures and results. US Bureau of Mines Rept. Inv. 8515, 36 pp.
3. Harnsberger, T.K., 1919. The geology and coal resources of the coal-bearing portion of Tazewell County. Virginia Geological Survey Bulletin 19, 195 pp.
4. Henika, W.S., 1994. Internal Structure of the coal-bearing portion of the Cumberland Overthrust Block in southwestern Virginia and adjoining areas. Geology and Mineral Resources of the southwest Virginia coalfield. Virginia Division of Mineral Resources Publication 131, pp. 100–120.
5. Oil and gas wells drilled in southwestern Virginia before 1950;Huddle;U.S. Geological Survey Bulletin,1956