TLS as president, one page, 6.75 x 8.75, White House letterhead, August 31, 1968. Letter to the Hon. Martin E. Underwood, in full: "Thank you for your kind remembrance of my birthday. I read your message with deep appreciation for your continued confidence and goodwill. You have been a strong right arm." In fine condition. Underwood was an advance man on the staff of JFK and LBJ, and was in the motorcade when Kennedy was assassinated in Dallas. After the president's death, Underwood took dictation from then-Attorney General Robert F. Kennedy, who called from Washington with the words to the presidential oath so Vice President Lyndon B. Johnson could be sworn in as president aboard Air Force One.Format: TLS