00588nam a2200157Ia 4500 0000021364 20251012174640.0 930702s1977 us 0 eng c 052121114X HD2075 Economic development as an adaptive process the green revolution in the Indian Punjab Richard H. Day, Inderjit Singh London Cambridge University Press 1977 x, 326p ill 23cm. Agriculture Economic aspects India Punjab (State) Mathematical models Economic development Mathematical models 7999 7999