The 1951 definitives, air mail issues and reprints
Subtitle: the first U.N. definitive issues : a photographic guide to assist in understanding the various printings of the 1951 series of United Nations regular and air mail definitive stamps
By: [by Otto Wolke].
Publisher: United Nations Study Unit of the American Topical Association
Published: 1974
Place of publication: Brooklyn
Language: eng
Number of pages: 96
Subjects: United Nations -- Postal service.