00597cam a2200169 a 450000500170000000800410001702000150005804000280007308200230010110000270012424500570015126000320020830000230024050000720026350400460033565000460038120181210002837.0820930s1982    enk           001 0 eng d  a0333316908  aBNBbengcBNBdBD-DhBPA  a371.3033bWAE 19821 aWagner, Leslie,d1943-14aThe economics of educational media /cLeslie Wagner.  aLondon :bMacmillan,c1982.  ax, 162 p. ;c23cm.  aTeaching aids: Audiovisual materials. Economic aspects (BNB/PRECIS)  aBibliography: p152-157. - Includes index. 0aAudio-visual educationxEconomic aspects.