Arthenayake,  N.R. <br/><br/>
Physical science  : Diploma in Technology . book 3 

 - Nugegoda :  Open University,  1986. 
 - 188p.;  28cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>500.02  / PHY