Bartleby.com has available its electronic version of the Columbia Encyclopedia with numerous updates, including improved search and navigation features. The sixth edition contains close to 51,000 entries, including 17,000 biographies, with over 80,000 hypertext cross-references, as well as links to other resources such as maps, speeches, and additional full-text collections held by Bartleby.com. Visitors may search the encyclopedia by keyword (either full-text or entry word), browse the entries alphabetically, or browse the biographical entries by 140 categories. Definitely one of the standard online general reference works.