Kahoku Kōtsū Kabushiki Kaisha

• Aigo sonmin katsuyaku gaikyō
• Chūgoku nōson shakaigaku gairon
• Hokushi-san shuyō jumoku no kyōjaku shiken ni tsuite (daiippō)
• Kahoku Mōkyō zakkoku jukyū chōsa hōkokusho
• Kahoku Mōkyō zakkoku jukyū chōsa hōkokusho kakuron
• Tansui yōshoku tekichi gaikyō chōsa hōkokusho
• Tetsuro aigoson
• Tetsuro aigoson jittai chōsa hōkokusho
• Tetsuro aigoson ni okeru Shōwa jūyonendo shuyō nōsanbutsu seisanhi chōsa hōkokusho (Keiko, Keikan ensen)
• [Kahoku Kōtsū Kabushiki Kaisha]
• 北支・蒙疆の経済建設