00684nam0-22002531i-450-990002589710403321000258971FED01000258971(Aleph)000258971FED0100025897120000920d1960----km-y0itay50------baENGPRODUCTIVITY AND TECHNICAL CHANGEDI SALT ERs.l.University of Cambridge1960Salter,Wilfred E. G.105287ITUNINARICAUNIMARCBK99000258971040332121-1-6-RAn.i.ECAECAProductivity and technical change44980UNINAING01