00407nam a2200133Ia 4500003000400000008004100004020001400045040000800059100001600067245011500083250001900198260004100217300001500258LDD181029s9999    xx            000 0 und d  a335000452  cLDD  aBates, Tony 0aEvaluating educational television and radiobproceedings of the International co Kingdom, 9-13 AprcTony Bates  aRobinson, John  aMilton KeynesbOpen Universityc1977  axviii, 410