GUPTA N C Productivity, investment and import substitution i - Delhi University of Delhi 1981 - 174p cm. - University of Delhi, Economics (Deptt. of-), Thesis. Thesis, University of Delhi, Economics (Deptt. of- . Source: General Book Subjects--Topical Terms: Non-metalIndustrial Econommics Dewey Class. No.: X9(F195):546.2.N7, M1/Th