Events and people of North America in the 20th Century. Includes Encyclopedia of American Immigration, Decades Series 1950s-1980s, Great Events from History, Great Lives from History, Milestone Documents in American History, Milestone Documents in World History.

A collection of encyclopedias and reference books providing information on different historial periods.  Includes some primary sources.  From Gale Virtual Reference Library.

Includes Decades in America - 20s through 80s and Great Events From History.  From Salem Press.

A collection of reference books, all primary sources of historically significant people and events.