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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) British Prime Minister Harold Wilson (10/16/1964-6/19/1970) German President Heinrich Lübke (9/13/1959-6/30/1969)