This series mostly contains photographic postcards taken by Lee Moorhouse of the Pendleton Round-Up in Pendleton, Oregon, from 1901-1919, including views of various rodeo events and Black, Native, and women participants. There are also two photographs of Round-Ups in Crooked River, Oregon, and Toppenish, Washington. Many of the photographs are duplicates or copy images made from original prints in the collection; there are also six film negatives made from photographs in this collection. Arranged into two subseries: 3.1, Pendleton Round-Up, and 3.2, Other Round-Ups.