00948nam0-22002891i-450-9900025029504033219211613388000250295FED01000250295(Aleph)000250295FED0100025029520000920d1991----km-y0itay50------baENG<<A >>Model Survey of Computer ServicesUnited Nations Department of International Economic and Social Affairs Statistical Office.New YorkUnited Nations1991.IV, 36 p.26 cmStatistical papers91Pianificazioni di indagini, Tecniche di rilevazioneNazioni Unite.Department of Economic and Social Affairs493245ITUNINARICAUNIMARCBK990002502950403321XV-C-112182MASMASModel Survey of Computer Services440467UNINAING01