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. (January 23, 2019). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/columbia-sheep
"Columbia sheep." The Columbia Encyclopedia, 6th ed.. . Retrieved January 23, 2019 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/columbia-sheep