“Instructional film research reports” NAVEXOS P-1220

1955 ◽  
Vol 3 (4) ◽  
pp. 306-311
Author(s):  
L. Twyford
Author(s):  
Charles F. Hoban ◽  
Edward B. Van Ormer

Nature ◽  
1959 ◽  
Vol 184 (4690) ◽  
pp. 866-867
Author(s):  
C. DENIS PEGGE

Nature ◽  
1951 ◽  
Vol 168 (4279) ◽  
pp. 775-776 ◽  
Author(s):  
C. DENIS PEGGE

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