Access to full-text online copies of Encyclopaedia Britannica content. With search features and multimedia galleries.

Gives information about Smithsonian departments, as well as topics from Art to Zoology.

Free Internet library featuring reference works like Oxford Dictionaries, Britannica Concise Encyclopedia, and newspaper and magazine articles.

Free online encyclopedia covering topics in the arts, history, humanities, literature, science, nature, and technology.

Procedure-centric reference covering an extensive range of topics - from electronics to travel.

Free and volunteer-run content encyclopedia presents articles on a wide range of subjects. Viewable in different language versions.

Learning resource package integrating an encyclopedia, dictionary, and atlas in one presentation.