Britannica Book of the Year. Chicago: Encyclopædia Britannica, 1936-.
R 032 B77
(Years missing are: 1950, 1953, 1964 - 1972)
Facts on File Year Book. New York: Facts on File Publications, 1940-.
R 050 F11
The World Book Almanac. New York: World Almanac Books, 1923-.
R 317.3 W89
(Years missing: 1924 - 1926, 1932 - 1933, 1945, 1947, 1949, 1953, 1957, 1974, 1980)
Electronic Sources for chronology and timeline information:
