The Colorado Encyclopedia, although it is in “prototype” development, has enough information to provide a reader with a multitude of topics. Broadly arranged by people, places, events, and things, this site contains articles that include internal links, bibliographies, and outside sites of relevance. For instance, the article on Kit Carson is headed by the last photo of him and then proceeds to offer a reasoned biography of the man along with internal links to other articles in the encyclopedia and outside readings. Well worth a perusal.
Online State Encyclopedias: Colorado