Rulon, Phillip Justin, 1900- <br/><br/>
The sound motion picture in science teaching 
By Phillip Justin Rulon 
 - Cambridge, Mass.  Harvard University Press  1933 
 - xi,  236 p. : ill. ; 23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching<br/>Motion pictures in education<br/>Sound motion pictures