Paul, Ruth <br/><br/>
Physical sciences on file 

 - New York  Oxford  1989 
<br/><br/><label>ISBN: </label>081602068X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching---Audio-visual aids
<br/><br/><label>LC Class. No.: </label>Q 180 .A1 .P48/