Access Science
The McGraw-Hill Encyclopedia of Science and Technology, with enhancements for students.

Encyclopedia Americana
General encyclopedia with enhanced content.

Gale Virtual Reference Library
Reference books on subjects such as business, history, law, philosophy, psychology, religion, and science.

Grolier Multimedia Encyclopedia
Enhanced encyclopedia for middle and high school students.

Oxford English Dictionary
Word entries include definitions, pronunciation, and history, with quotations that trace usage over time.

New Book of Knowledge
Student encyclopedia.

World Book Online
Encyclopedia for students and adults; with multimedia enhancements.