Photographs taken by Major Lee Moorhouse between approximately 1897 and 1919, depicting Cayuse, Umatilla, and other Native peoples and their settlements in the Columbia River Basin and Umatilla County; landscapes in Oregon and Montana; the Pendleton Round-Up in Pendleton, Oregon, and rodeos in other locations.

Collection includes photographic postcards of landscapes in Oregon, Washington, Idaho, and Yellowstone National Park from 1904-1940. Wesley Andrews was both the photographer and the printer of these photographic postcards.