Edmund Flagg, Flagg's The Far West, 1836-1837…
“ The Big Horn River, so called from the Rocky Mountain sheep, rises in the Wind River range, near the centre of Wyoming, flows north through the Big Horn Mountains into Montana, and bending toward the northeast joins the Yellowstone as its principal tributary. South of the Big Horn Mountains, the stream is usually called Wind River. The Big Horn Valley, the home of the Crows, was a rich fur-bearing region and frequently visited by trappers and traders.—Ed. ”
