Scope and Contents Pictures take by Robert N. Allen of Los Angeles, California. Along San Juan and Colorado Rivers in 1921. Allen was recorder of K.W. Trimble, Topographic Engineer of U.S.G.S., who was Chief of Party. The following captions were taken directly from the album, and all of the images were taken from June through October, 1921 1: Chenoweth U.S.G.S. camp at Green River, Utah 2: Bluff and our Ford at...