國內郵便業務
By: Chʻoe Yŏng-ho chŏ
Publisher: Chʻesŏnghoe
Published: 1971
Place of publication: Sŏul
Language: kor
Number of pages: 237
Subjects: Postal service
Other titles: Kungnae upʻyŏn ŏmmu
Notes: Bibliography: p. 2 (4th group)