In “A Postage Stamp History of the United States in the Twentieth Century” (December 1982) the following stamps were dated incorrectly: President McKinley stamp was issued in 1904, not 1902; Panama Canal stamp was issued in 1939, not 1913; Arizona stamp was issued in 1962, not 1961; Virgin Island stamp was issued in 1937, not 1938; President Hording stamp was issued in 1923, not 1925; President Roosevelt six-cent stamp was issued in 1966, not 1981; Eugene O’Neill stamp was issued in 1967, not 1981; Graf Zeppelin stamp was issued in 1930, not 1928; Puerto Rico stamp was issued in 1937, not 1949; George C. Marshall stamp was issued in 1967, not 1981 ; NA TO stamp was issued in 1952, not 1951; Ralph Bunche stamp was issued in 1982, not 1981; National Guard stamp was issued in 1953, not 1952; Peace Corps stamp was issued in 1972, not 1971; the American Woman stamp was issued in 1960, not 1961.