00346    a2200109   4500082001300000100002700013245003600040260008600076300001500162440003600177650002300213  a691bBOG  aBogahawatte, V. T. L.   aBuilding materials in Sri Lanka  aColombobNatural Resources, Energy &  Sciences Authority of Sri Lankac1993g1993  a38p.c21cm  aScience education series No. 32  aBuilding materials