The Gale Encyclopedia of the Unusual and Unexplained
Industrial Revolution Reference Library
Great Depression and the New Deal Reference Library
Nonfiction Classics for Students
Learning and Memory: Macmillan Psychology Reference Series
Reference Guide to World Literature
Junior Worldmark Encyclopedia of Physical Geography
Geo-Data: World Geographic Encyclopedia
CDs, Super Glue, & Salsa: How Everyday Products Are Made
Macmillan Encyclopedia of Death and Dying