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Letter Rate 6¢ Package Rate 6¢ Postcard Rate 5¢ Effective 1/1/1968 American President Richard Nixon (1/20/1969-8/9/1974) Argentine President Roberto M Levingston (6/18/1970-3/23/1971) Australian Prime Minister John Gorton (1/10/1968-3/10/1971) Austrian President Franz Jonas (6/9/1965-4/24/1974) Bahamian Premier Lynden Pindling (5/10/1969-8/21/1992) Bahamian Prime Minister Lynden Pindling (5/10/1969-8/21/1992) Belgian Prime Minister Gaston Eyskens (7/17/1968-1/26/1973) Brazilian President Emílio Garrastazu Médici (10/30/1969-3/14/1974) Brazilian Minister of the Navy Emílio Garrastazu Médici (10/30/1969-3/14/1974) Brazilian Minister of the Army Emílio Garrastazu Médici (10/30/1969-3/14/1974) Brazilian Minister of the Air Force Emílio Garrastazu Médici (10/30/1969-3/14/1974) British Prime Minister Edward Heath (6/19/1970-3/4/1974) Canadian Prime Minister Pierre Trudeau (4/20/1968-6/3/1979) East German President Walter Ulbricht (9/12/1960-8/1/1973) German President Gustav Heinemann (7/1/1969-6/30/1974) Japanese Prime Minister Eisaku Sato (11/9/1964-7/7/1972)