TY  - BOOK
AU  - Henry, Nelson B.
TI  - The forty-first yearbook of the National Society for the Study of Education: Part 1 : audio-visual materials of instruction 
U1  - 370.1 
PY  - 1949///
CY  - Place of publication not identified
PB  - University of Chicago Press
KW  - Education
N1  - License restrictions may limit access
UR  - http://www.columbia.edu/cgi-bin/cul/resolve?clio11371781
ER  -