Crocker, A. H. <br/><br/>
Supplement to a survey of overhead projectors /  
A. H. Crocker. 
 - London :    National Committee for Audio-Visual Aids in Education; E ducational Foundation for Visual Aids,    1969. 
 - 72 p. :    ill. ;    21 cm. 
 - National Committee for Audio-Visual Aids in Education. Experimental Development Unit. Report ;    no. 6 .
<br/><br/><label>ISBN: </label>0900553014 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Projectors.<br/> Overhead projection.
<br/><br/><label>Dewey Class. No.: </label>P 371.3352 CRO