Since 1998, in addition to the print and CD-ROM editions of the 22-volume, 13,800-page encyclopedia, "World Book" also publishes an online version called "World Book Online". The online version includes 23 subscription databases with all of the articles contained in the print set, as well as several thousand additional articles and the contents of every yearbook "World Book" has published since 1922. Articles are also available in Spanish. The online version contains links to current web sites and magazine articles, a news section, and video and audio samples.