Washington Irving,
Astoria; Or, Anecdotes of an Enterprise Beyond the Rocky Mountains
“ The silver fox is a rare animal, a native of the woody country below the falls of the Columbia River. It has a long, thick, deep lead-colored fur, intermingled with long hairs, invariably white at the top, forming a bright lustrous silver gray, esteemed by some more beautiful than any other kind of fox. The skins of the buffalo, of the Rocky Mountain sheep, of various deer and of the antelope, are included in the fur trade with the Indians and trappers of the north and west. ”
