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Copy:
18th ed. (1933), 19th ed. (1934), 21st ed. (1936), 23rd ed. (1938), 28th-36th ed. (1943-1951), 39th-48th ed. (1954-1963), 53rd-59th ed. (1968-1974), 60th-64th ed. (1975-1979), 71st ed. (1986), 73rd-76th ed. (1988-1991),
78th ed. (1993), 82nd ed. (1997)
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