Dudley, William H.  1868-1941. <br/><br/>
Organization for visual instruction / 
by W.H. Dudley. 
 - Washington :  G.P.O.,  1921. 
 - 24 p. ;  23 cm. 
 - Bulletin / Department of the Interior, Bureau of Education ;  1921, no. 7 .
 - Bulletin (United States. Bureau of Education) ;  1921, no. 7 .
<br/><br/><label>LCCN: </label>e  22000036  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Motion pictures in education--United States.<br/>Slides (Photography)
<br/><br/><label>LC Class. No.: </label>L111  / .A6 1921, no. 7