Mugijil piryo sanŏp ŭi tonghyang kwa palchŏn pangan : konggŭp ch'egye kaesŏn pangan ŭl chungsim ŭro = Inorganic fertilizer industry trend and development plan : Focusing on improving the supply system
Nongnimŏp hubang yŏn'gwan sanŏp ŭi chŏllyakchŏk palchŏn pangan = Development directions for backward linkage industries in the agriculture, forestry and fisheries : with reference to fertilizer and pesticides