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ISO 7404-3:1994
Methods for the petrographic analysis of bituminous coal and anthracite -- Part 3: Method of determining maceral group compositionstandard by International Organization for Standardization, 10/01/1994
Cancels and replaces the first edition (1984). Specifies a method of determining the proportions of the maceral groups (and the minerals if desired) in coals. Concerned only with determinations made on polished particulate blocks using reflected white light. Not concerned with the determination of the proportions of naturally occurring maceral associations.
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