Gale Virtual Reference Library
Selected reference books, including subject-specific encyclopedias, biographies, social studies and histories.

The Oxford Encyclopedia of Maritime History
The Encyclopedia covers the entire history of seafaring, from ancient Egyptian shipbuilders to the nuclear submarines and supertankers of today. Over nine hundred articles written by leading historians examine all aspects of maritime history.

Grove's Dictionary of Art
Coverage of all types of visual arts

Grove's Dictionary of Music
Coverage of classical, popular, jazz and world music

Internet Archive : Text Archive
The Open-Access Text Archive is a searchable collection of over 30,000 titles..

NetLibrary
Over 3,000 titles covering subject areas in education, psychology, science and social sciences as well as business, computer science.  Some reference books as well..

Funk & Wagnalls New World Encyclopedia
Provides over 25,000 encyclopedic entries covering a variety of subject areas

National Academy Press
A continually growing collection of over 2000 titles on a wide range of topics in science, engineering, and health

Google Book Search
Searches the full text of 10,000 public domain books that Google scans and stores in its digital database.