000			00319nam a2200133Ia 4500
100			_aI. E.C.
020			_a0-19-504994-2
250			_aVol.2
942			_cBK
245			_aInternational Encyclopedia of Communications
260			_aOxford University Press, New York _c1989
082			_aR 001.5 I. E. C
300			_a506
999			_c65135 _d65135