00837cam a22002411 4500 e 41000369 DLC 20260227111230.0 790131s1940 dcua b 000 0 eng c e 41000369 (OCoLC)4603104 U.S. Off. of Educ. Libr. DNIE DLC premarc LB1044 .N42 National Education Association of the United States. Department of Elementary School Principals. Visual education. Department of Elementary School Principals of the National Education Association. Washington, D.C. 1940. 94, [1] p. illus. 23 cm. Lithoprinted. "Sources of material and bibliographies": p. [68]-94. Visual education. Motion pictures in education. 21840 21840