Junior Worldmark Encyclopedia of Physical Geography
Industrial Revolution Reference Library
The Gale Encyclopedia of the Unusual and Unexplained
Nonfiction Classics for Students
Great Depression and the New Deal Reference Library
Historic Events for Students: The Great Depresssion
Political Theories for Students
Africa: An Encyclopedia for Students
Renaissance and Reformation Reference Library
Learning About the Holocaust: A Student's Guide
The Ancient Near East: An Encyclopedia for Students
Westward Expansion Reference Library