De Silva,T.K.Nimal P and others <br/><br/>
Scientific Principles Seen in Ancient Artefacts and Monumental Structures 

 - Colombo  Natural Resources Energy  Science Authority of Sri Lanka  1995 
 -  54p, 21 cm 
<br/><br/> Science Education SeriesNo.36 
<br/><br/><label>Universal Decimal Class. No.: </label>902 DES