Katsuya Yaguchi

• "Nōgyō nōsei kaikaku" no kadai
• EC no nōsei kaikaku
• Kome jiyūka mondai to nōgyō kōzō kaikaku
• Kōteieki mondai / ̂̂
• Kyūzōsuru shokuryō yunyū no jittai to eikyō
• Nichi-Bei nōgyō masatsu no haikei to shōten
• Shokuryō wa ikani shite buki to natta ka