00543    a2200157   4500082001500000100002900015245007800044260008500122300001500207440003600222650001500258650003900273700002000312700002200332700003100354  a630.1bSCI  aSilva, T. K. Nimal P. De  aScientific principles seen in ancient artefacts and monumental structures  aColombobNatural  Resources Energy and Science Authority of SriLankac1995g1995  a54p.c21cm  aScience education series No. 36  aTechnology  aAgriculture and related technology  aUragoda, C. G.   aMendis, D. L. O.   aWickramanayaka,  V. E. A.