TY  - BOOK
AU  - Dudley,William H.
TI  - Organization for visual instruction
T2  - Bulletin / Department of the Interior, Bureau of Education
AV  - L111 .A6 1921, no. 7
PY  - 1921///
CY  - Washington
PB  - G.P.O.
KW  - Motion pictures in education
KW  - United States
KW  - Slides (Photography)
ER  -