PBS
Pbs the West: Charles Goodnight
Charles Goodnight (1836-1929) was one of the most prosperous cattleman of the American West. Read a thorough biography about him here at this site.
Nebraska Studies
Nebraska Studies: High Falutin' Beef
This is an impressive history of the introduction of beef to the Great Plains region complete with videos, photos, and lesson plans.
Houghton Mifflin Harcourt
Harcourt: School Publishers: Join a Cattle Drive
At this site take a look at maps of cattle drives from the ranches and ranges of Texas to the market places in Kansas, Nebraska, Colorado and Wyoming.
Other
Southwest Collection: The Texas Ranching Frontier
Discusses the cattle drive era that occurred in the late 1800s. It gives details about the drives from Texas to the north.
Ancestry
Ok Gen Web Project: The Chisholm Trail and the Overland Cattle Trade
Description of the establishment and use of the Chisholm Trail for cattle drives in the mid- to late-1800s.