Merriam, N.; Sethi, V.; Thomas, K. & Grimes, R. W. The production of a premium solid fuel from Powder River Basin coal. [COMPCOAL Process], article, January 1, 1992; (https://digital.library.unt.edu/ark:/67531/metadc1449374/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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