Ulrich, G.E., Billingsley, G.H., Hereford, Richard, Wolfe, E.W., Nealey, L.D. and Sutton, R.L., 1984, Map showing geology, structure, and uranium deposits of the Flagstaff 1 degrees x 2 degrees quadrangle, Arizona: U.S. Geological Survey, Miscellaneous Investigations Series Map I-1446, scale 1:250000.