Other
American Hereford Association
Everything one could want to know about Hereford cattle can be found at this site. Information on showing them, marketing them, breeding them, genetics, history, how-to videos, event listings, and lots more.
Oklahoma State University
Oklahoma State University: Breeds of Livestock Cattle
A comprehensive list of most of the breeds of domesticated livestock that are used in the cattle industry. Brief history of their use and links to background and use of each breed.