Education and training media.
Contributors: Finch, Glen, 1909-
Series: National Research Council (U.S.) Publication -- 789.; Publication (National Research Council (U.S.)) -- no. 789.
Publisher: National Research Council
Published: 1960
Place of publication: Washington
Language: eng
Number of pages: 206
Subjects: Teaching -- Aids and devices -- Congresses.
Notes: Includes bibliographies.