Bill Williams

Simpson, R.W., Jachens, R.C., Saltus, R.W., and Blakely, R.J., 1986, Isostatic residual gravity, topographic, and first-vertical-derivative gravity maps of the conterminous United States: U.S. Geological Survey Geophysical Investigations Map GP-0975, 2 sheets, scale 1:7,500,000.

Hildenbrand, T.G., Simpson, R.W., Godson, R.H., and Kane, M.F., 1987, Digital colored Bouguer gravity, free-air gravity, station location, and terrain maps for the conterminous United States: U.S. Geological Survey Geophysical Investigations Map GP-0953B, 2 sheets, scale 1:7,500,000.

Hildenbrand, T.G., Simpson, R.W., Godson, R.H., and Kane, M.F., 1982, Digital colored residual and regional Bouguer gravity maps of the conterminous United States with cut-off wavelengths of 250 km and 1000 km: U.S. Geological Survey Geophysical Investigations Map GP-0953A, 2 sheets, scale 1:7,500,000.

Diment, W.H., and Urban, T.C., 1981, Average elevation of the conterminous United States (Gilluly averaging method): U.S. Geological Survey Geophysical Investigations Map GP-0933, 2 sheets, scale 1:2,500,000.

Saltus, R.W., and Jachens, R.C., 1995, Gravity and basin-depth maps of the Basin and Range Province, western United States: U.S. Geological Survey Geophysical Investigations Map GP-1012, 1 sheet, scale 1:2,500,000.

U.S. Geological Survey, [1963?], Surface water records of Arizona - 1962: U.S. Geological Survey, 185 p.

U.S. Geological Survey, [1964?], Surface water records of Arizona - 1963: U.S. Geological Survey, 191 p.

U.S. Geological Survey, [1962?], Surface water records of Arizona - 1961: U.S. Geological Survey, 167 p.

U.S. Geological Survey, [1966?], 1965 water resources data for Arizona - Part 1. Surface water records: U.S. Geological Survey, 212 p.

U.S. Geological Survey, [1965?], Water quality records in Arizona - 1964: U.S. Geological Survey, 80 p.