Columbia sheep, medium-wool breed developed in the United States using Lincoln and Rambouillet sheep crosses. The breed was developed primarily for the Western ranges but is also used successfully in farm flocks. Columbias are white-faced, hornless, and relatively large in size and are prolific breeders.
"Columbia sheep." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (November 14, 2018). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/columbia-sheep
"Columbia sheep." The Columbia Encyclopedia, 6th ed.. . Retrieved November 14, 2018 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/columbia-sheep