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International Journal of Coal Geology > 2002 > 50 > 1-4 > 135-168
International Journal of Coal Geology > 2002 > 50 > 1-4 > 169-214
International Journal of Coal Geology > 2002 > 50 > 1-4 > 135-168
International Journal of Coal Geology > 2002 > 50 > 1-4 > 169-214