ronald reagan: n. ronald reagan (1911-2004), 40th president of united states (1981-89)
ronald regan: n. ronald regan (born 1911) 40th president of united states (1981-89)
john ronald reuel tolkien: n. john ronald reuel tolkien, j.r.r. tolkien (1892-1973), south african-born professor of english literature, author of numerous fantasy stories including "the hobbit" and "the lord of the