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Petrology And Chemistry Of Permian Coals From The Paraná Basin: 1. Santa Terezinha, Leão-Butiá And Candiota Coalfields, Rio Grande Do Sul, Brazil

W. Kalkreuth, M. Holz, M. Kern, G. Machado, A. Mexias, M.B. Silva, J. Willett, R. Finkelman, H. Burger

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