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