Each annual supplement to the Encyclopedia of World Biography, 2nd Edition, contains 200 biographical entries new to the set. Each volume includes a balance of historic and contemporary figures who, like those appearing in the Encyclopedia of World Biography base set, have made a significant contribution to human culture and society. Entries offer an in-depth biographical essay approximately 2, 000 words in length, as well as a bibliographic section, which may include books, periodicals, or online websites to consult for further research. Many entries include a portrait of the individual.