Nittei 50-nen no ayumi
Subtitle: Shiryō hen
By: [henshū Nihon Yūbin Teisō Kabushiki Kaisha Shashi Henshū Iinkai]
Publisher: Nihon Yūbin Teisō Kabushiki Kaisha
Published: 1992
Place of publication: Tōkyō
Language: jpn
Number of pages: 250
Subjects: Sources; Nihon Yūbin Teisō Kabushiki Kaisha; History
Other titles: Nittei gojūnen no ayumi.