The thirteenth edition (1955) was called the "Centennial Edition." It was credited to the editors of Little, Brown, but the preface gives special thanks to Morley, Everett, and Emily Morison Beck (1915–2004). This edition included more recent quotations. The two youngest people quoted were cartoonist Bill Mauldin and Queen Elizabeth II. Beck also edited the fourteenth edition (1968) and the fifteenth (1980).