00492cam a2200133Ma 4500008004100000020001500041245011400056260006800170300001900238650003400257650002300291650001800314050002600332050705s2003    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 industry 0aIndustrial surveys 0aRaw materials14aHF1054.N6bR3896 2003