[PRESIDENTS & FIRST LADIES]. KENNEDY, JOHN FITZGERALD. Autograph "favor frank" ("John Kennedy") on an envelope (letter not present) with calligraphic address, Washington, D.C. 21 January 1961 machine cancel (the day after his inauguration) -- KENNEDY, JACQUELINE B. Typed letter signed ("Jackie") as First Lady, with five-line autograph postscript, to "Phelan," Washington, 27 June 1961, 1 page, 8vo, on White House stationery, postscript reading: "What bad luck I have - to miss you at the Inauguration & now. This has been such a frantic winter - but we'll make up for it..."; Typed letter signed ("Jacqueline Kennedy") to Robert Davidson of Westminster College, n.p., 7 June 1965, 1 page, 8vo, on black-bordered mourning stationery, thanking him for an album of Churchill commemorative stamps: "I am deeply touched that you were prompted to do this in memory of President Kennedy....I know that he would have been most pleased...."; Printed franking signature on envelope addressed to Davidson, New York machine cancel -- JOHNSON, LYNDON BAINES. Printed free frank on an envelope addressed to Robert Davidson, Austin, Texas, 14 December 1970 machine cancel with map of Texas, "Air Mail" handstamp -- JOHNSON, CLAUDIA ALTA TAYLOR ("Lady Bird"). Autograph free frank ("Mrs. Lyndon B. Johnson") on envelope (letter not present) addressed to Robert Davidson, on LBJ Ranch imprinted envelope, Stonewall, Texas, 20 May 1975 machine cancel, "Air Mail" handstamp -- NIXON, RICHARD MILHOUS. Autograph free frank ("Richard Nixon") as Vice-President, on envelope (letter not present) addressed to C.C. Hart, Washington, D.C., 7 June 1960 machine cancel; Handstamp frank on envelope (letter not present) addressed to Mrs. James Mills, purple circular Sam Clemente, Ca., 4 April 1975 datestamp. (8)