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Wieber, P.R.; Martin, J.W. & Byrer, C.W. (eds.). Proceedings of the ninth annual underground coal gasification symposium, article, December 1, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc1065489/m1/1/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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