00552cam a2200157Ma 4500999001700000008004100017020001500058245011400073260006800187300001900255650003800274650002700312650002200339942000700361050002600368  c41507d41507050705s2003    nr a          000 0 eng d  a978807003510aMulti-disciplinary committee report of a techno-economic survey on non-metallic minerals sector (4th update).  aAbuja :bRaw Materials Research and Development Council,c2003.  a117 p.  ; ill. 0aNonmetallic minerals industry975 0aIndustrial surveys976 0aRaw materials977  cBK14aHF1054.N6bR3896 2003