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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