Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona - Beard, L.; Anderson, R.E.; Block, D.L.; Bohannon, R.; Brady, R.J.; Castor, S.B.; Duebendorfer, E.; Faulds, J.; Felger, T.J.; Howard, K.; Kuntz, M.; Williams, V. (Open-File Report, 2007)