00294    a2200109   4500020001500000082001500015100002400030245003000054260005800084300002100142650002100163  a9559370010  a553.8bDHA  aDharmaratne, P.G.R.  aGEM industry of Sri Lanka  aColombobGeological Survey & Mines Bureauc2005g2005  aviii,113p.c24cm  aEconomic Geology