1911 Encyclopædia Britannica
The Encyclopædia Britannica Eleventh Edition (1910–1911) is one of the most famous editions of the Encyclopædia Britannica.  Some of its articles were written by the best-known scholars of the time. The articles are still of value and interest to modern scholars as examples for the knowledge of the 19th and early 20th centuries. They contain, however, a number of problematic areas for the modern scholar using them as a source. The eleventh edition is no longer restricted by copyright and is available online, both in its original text and in part in other online encyclopaedias and works.