Yoon, R. H. & Richardson, P. R. Control of pyrite surface chemistry in physical coal cleaning. Tenth quarterly progress report, December 1, 1991--February 29, 1992, report, June 24, 1992; (https://digital.library.unt.edu/ark:/67531/metadc1318635/m1/1/: accessed May 31, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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