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REPORT ON THE ACTIVITIES OF THE SUB-COMMITTEE ON THE INDUSTRIAL APPLICATIONS OF COAL PETROGRAPHYKAYE N.sdIN : 7EME CONGR. INT. STRATIGR. GEOL. CARBONIFERE. KREFELD, 1971. C.R.; KREFELD GEOL. LANDESAMT NORDRHEIN-WESTFALEN ,1972, VOL. 1, P. 277 A 279Miscellaneous