Focus onscience. Exploring the physical world 
Flanagan J. Frank 
 - Canada  D.C Health Canada ltd  1979 
 - 329p. 
<br/><br/><label>ISBN: </label>0-669-00842-7 
<br/><br/><label>Subjects--Topical Terms: </label>--School of Pure and Applied Sciences
<br/><br/><label>LC Class. No.: </label>QC 23  / .F53 1979