371.3078
U62E
           Undwin, Derick (Ed.)
               The Encyclopaedia of educational media communication and technology \ Derick Undwin - London : McMillan, 1978.
               xviii, 800p.
                ISBN: 0-333-18550-1

103558
                Subjects: Educational technology-United States-Encyclopedias; Ccommunication in education- Encyclopedias-United States; United States-Communication and technology-Encyclopedias.