Japan. Teishinshō. Denmukyoku

• Hōki kenkyū oyobi sōshin renshūyō Wabun denpō reishū
• Insatsu tsūshinjutsu
• Iroha-betsu Denshinkyoku shomeiroku
• Ōbun denpō toriatsukai tebiki
• 外國電報料金表