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Hudnall , W. H. 1982. A baseline characterization of the existing natural soil and the overburden material in the potential lignite mining areas of Louisiana, La. Board Reg. Final Rpt. 274
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Dunigan , E. P. 1983. A baseline characterization of the existing natural soil and the overburden material in the potential lignite mining areas of Louisiana, La. Board Reg. Fin. Rpt. 271