Ho-chʻŏl Yi

1951

• Chiyŏk nongŏp ŭi simchʻŭng yŏnʾgu
• Chosŏn chŏng̕i nongŏp kyŏngjesa
• Hanʾguk nŭnggŭm ŭi yŏksa, kŭ kiwŏn kwa palchŏn
• Nongŏp kyŏngjesa yŏnʾgu
• Nŭnggŭm tŭnggŭphwa ŭi simchʻŭng yŏnʼgu =
• Pyŏrang wi ŭi uri nongŏp ŏttŏkʻe kuhal kŏsinʼga
• Sanŏphwa wa nongŏp kyŏngje