What is a Community Encyclopedia?

The following is part of an alphabetical list from the table of contents from one of the finished community encyclopedias. Entries could vary in length, the way they do in most encyclopedias:

Appaloosa
Architecture
Art
Avalanches
Back-to-the-land (movement)
Banks
Barns
Basques
Batesville
Bears
Berland Building
Bighorn
Bighorn bow
Black marble
Blacks
Boise Cascade

You get the idea!