Junior Worldmark Encyclopedia of Physical Geography
St. James Encyclopedia of Labor History Worldwide
Industrial Revolution Reference Library
The Gale Encyclopedia of the Unusual and Unexplained
Great Depression and the New Deal Reference Library
Reference Guide to World Literature
Learning and Memory: Macmillan Psychology Reference Series
Nonfiction Classics for Students
UXL Encyclopedia of World Biography
Geo-Data: World Geographic Encyclopedia
Macmillan Encyclopedia of Death and Dying