00772nam a2200181Ia 4500 190328s9999||||xx |||||||||||||| ||und|| 62-7044 NITIL NITIL 21st 338.018 N277R National Bureau of Economic Research (New York)and Social Science Research Council (US).Committee on Economic Growth The Rate and direction of inventive activity economic and social factors; a conference of the universities Princeton Princeton Univesrsity Press 1962 x, 635p. National bureau of economic research.Special conference seri es;13 A report of the National Bureau of Economic Research, New York Inventions; Economic development BKS 16733 16733 0 0 DDC 0 0 NITIL NITIL 2019-04-02 0 338.018 N277R 39462 2019-04-02 00:00:00 2019-04-02 BKS