IS:09127 (Pt.5)-1986; Methods for petrograhic analysis of coal. Pt. <5=five>: Microscopical determination of the reflectance of vitrinite

IS:09127 (Pt.5)-1986; Methods for petrograhic analysis of coal. Pt. <5=five>: Microscopical determination of the reflectance of vitrinite - New Delhi BIS 1987 - 12p

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