00443naa a2200157 a 450000100080000000500110000800800410001910000140006024500660007426000090014065000160014965000130016565300180017865300120019677300770020818266982010-01-10       1977    bl ---       0--  u    #d1 aSINGH, K.  aReturns to investment on agricultural research in the punjab.  c1977  aAgricultura  aPesquisa  aInvestimentos  aRetorno  tIndian Journal of Agricultural Economicsgv. 32, n. 3, p. 202-207, 1977.