Principal convention of Mexico. November 9, 1926.
Subtitle: Together with the detailed regulations for its execution.
Contributors: Postal Union of the Americas and Spain.; United States. Post Office Dept.
Publisher: Govt. Print. Off.
Published: 1927
Place of publication: Washington
Language: eng
Number of pages: 29
Subjects: Postal conventions.
Notes: At head of title: Pan-American Postal Union.
Spanish and English in parallel columns.
Seal of Post Office Department, United States of Americas, on t.-p.