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Coal Classification Lignite

sub-bituminous coal, kentucky geological survey, university ,they are transitional between lignite and bituminous coal. in the u.s. rank classification, sub-bituminous coals and their subdivisions (a, b, .subbituminous coal - an overview,in brown coal, texture means the fragments of plant materials and/or wood for lack of a standard macrolithotype classification for subbituminous coals, it is .accessscience from mcgraw-hill education,outside north america, low-rank coal is classified as brown coal, which includes lignite, subbituminous, and most high-volatile c bituminous coal of the north .

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