72334786
Aug 8, 1969
Dec 12, 1972
EDUCATIONAL CURRICULUM MATERIALS, TESTING PROGRAMS, AND SOFTWARE PROGRAMMING, CONSISTING OF AUDIO TAPE SCRIPTS, SLIDES, FILMS, BOOKS, WORKBOOKS, INSTRUCTORS' MANUALS AND GUIDES, PAMPHLETS, HANDOUT SHEETS, DRILLS, EXERCISES, QUIZZES, TESTS, AND ANSWER KEYS
Telecommunications