na INLIS000000000004186 Ind 0010-1118004186 Economic policy and technology determinants of the comparative advantage of wheat production in Sudan HASSAN, Rashid M. Rashid M. Hassan and Hamid Faki Lisboa CIMMYT 1993 x, 70 p.: ill.; 26 cm.-- x, 70 p.: ill.; 26 cm.-- 631.16 WHEAT AGRICULTURAL PRODUCTS SUDAN 613/MS/94