au.\*:("CHEONG CH")
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GEOLOGICAL REPORT ON HAMCHANG GRAPHITE REGION.SON CM; CHEONG CH; KIM BK et al.1967; GEOL.REP.COAL.FIELDS.KOREA.; 1967(12), NUM. 0008, P. 95 A 117Miscellaneous
GEOLOGY OF THE DANYANG COAL FIELD.SON CM; CHEONG CH; KIM BK et al.1967; GEOL.REP.COAL.FIELDS.KOREA.; 1967(12), NUM. 0008, P. 73 A 93Miscellaneous