The Gale Encyclopedia of the Unusual and Unexplained
UXL Encyclopedia of World Biography
Reference Guide to World Literature
Great Depression and the New Deal Reference Library
Industrial Revolution Reference Library
Nonfiction Classics for Students
Learning and Memory: Macmillan Psychology Reference Series
St. James Encyclopedia of Labor History Worldwide
Geo-Data: World Geographic Encyclopedia
CDs, Super Glue, & Salsa: How Everyday Products Are Made