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: International Geophysical Year, July 1, 1957, to December 31, 1958.
I. J. P. O.: Imperial Japanese Post Office, Japanese Offices Abroad, postmark used in China and Manchuria mail.
Ikapiae: Greece-Icaria (Nicaria).
Ikaria: see Icaria.
International Geophysical Year Stamp"; Jerone R. Hart, "Great Britain Rates and Uses of the Photogravure Definitives 1934-1939"; Egbert Heinemann, "Postal History of German East Africa 1890-1918 Including German Seapost to East Africa"; ...
 See also: Single, Stamp, Topical, Error, Frank
  
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