Organization for visual instruction
By: by W.H. Dudley.
Series: Bulletin / Department of the Interior, Bureau of Education ;; 1921, no. 7; Bulletin (United States. Bureau of Education) ;; 1921, no. 7
Publisher: G.P.O.
Published: 1921
Place of publication: Washington
Language: eng
Number of pages: 24
Subjects: Motion pictures in education -- United States; Slides (Photography)