Garstka, W.U., Phillips, H.B., Allen, I.E., and Herbert, D.J., 1958, Withdrawal of water from Lake Mead, in Harbeck, G.E., Jr., Kohler, M.A., Koberg, G.E., and others, Water-loss investigations - Lake Mead studies: U.S. Geological Survey Professional Paper 298, p. 63-75.