The Gale Encyclopedia of the Unusual and Unexplained
St. James Encyclopedia of Labor History Worldwide
Nonfiction Classics for Students
Junior Worldmark Encyclopedia of Physical Geography
Industrial Revolution Reference Library
Great Depression and the New Deal Reference Library
Political Theories for Students
Historic Events for Students: The Great Depresssion
Africa: An Encyclopedia for Students
Renaissance and Reformation Reference Library
The Ancient Near East: An Encyclopedia for Students