Britannica features scholarly articles on a variety of subjects.

 image quest Image Quest has over 10,000 images that can be used for projects.

The Smithsonian Encyclopedia includes many online resources.

 oxford ref

The Oxford Reference Encyclopedia includes timelines, quotations, and bilingual dictionaries.


Scholarpedia is written by scholars. Experts must be invited or elected. Site is editable by anyone with a wiki, but updates must be approved before they are made final