Letter Rate 6¢ Package Rate 6¢ Postcard Rate 5¢ United States 1/13/1968 Johnny Cash at Folsom Prison Country singer Johnny Cash played for the inmates at California's Folsom Prison on January 13, 1968. This performance and the live album released afterward gave his career a well needed boost. American President Lyndon B Johnson (11/22/1963-1/20/1969) Argentine President Juan Carlos Onganía (6/29/1966-6/8/1970) 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 (1/16/1967-5/10/1969) Belgian Prime Minister Paul Vanden Boeynants (3/19/1966-7/17/1968) Brazilian President Artur da Costa e Silva (3/15/1967-8/31/1969) British Prime Minister Harold Wilson (10/16/1964-6/19/1970) Canadian Prime Minister Lester B Pearson (4/22/1963-4/20/1968) East German President Walter Ulbricht (9/12/1960-8/1/1973) German President Heinrich Lübke (9/13/1959-6/30/1969) Japanese Prime Minister Eisaku Sato (11/9/1964-7/7/1972)