Britannica Academic Edition: Aimed at college/university students, it contains the Encyclopedia Britannica plus Merriam-Webster's Collegiate Dictionary and Thesaurus, magazines, periodicals and other research tools.
Britannica Public Library Edition: Search Encyclopedia Britannica and Merriam-Webster Dictionary and Thesaurus. Also contains a Spanish-English dictionary and a notable quotations search.
Reference Books Online: General (i.e. encyclopedias) and subject specific reference works for all ages that can be downloaded or used online from the Gale Virtual Reference Library.
Salem Press Reference Collection: Reference books on history, science, health, and literature.