Birdseye, C.H., 1924, Plan and profile of Colorado River from Lees Ferry, Ariz., to Black Canyon, Ariz.-Nev., and Virgin River, Nev.: U.S. Geological Survey, 21 sheets (A-U) consisting of 14 plans (maps), scale 1:36,680, and 7 profiles [Contour interval on land 50 feet, Contour interval on river surface 5 feet].