Powell, G. H. <br/><br/>
A guide to the 8 mm loop film 
by G. H. Powell and L. S. Powell 
 - London  British Association for Commercial and Industrial Education  1967 
 - 43 p. : ill. ; 21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Moving--Pictures in education<br/>Moving--Pictures, Loop