Ilg, B.R., Karlstrom, K.E., Hawkins, D.P., and Williams, M.L., 1996, Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal processes: Geological Society of America Bulletin, v. 108, no. 9, p. 1149-1166.
Schaller, W.T., Stevens, R.E., and Jahns, R.H., 1962, An unusual beryl from Arizona: American Mineralogist, v. 47, nos. 5/6, p. 672-699.
Olson, J.C., and Adams, J.W., 1962, Thorium and rare earth in the United States, exclusive of Alaska and Hawaii: U.S. Geological Survey Mineral Investigations Resource Map MR-28, 16 p. 1 sheet, scale 1:3,168, 000.
Olson, J.C., and Hinrichs, E.N., 1957, Reconnaissance of beryl-bearing pegmatites in the Ruby Mountains, other areas in Nevada, and northwestern Mohave County, Arizona: U.S. Geological Survey, U.S. Atomic Energy Commission, Trace Elements Investigation Report TEI-655, 14 p.
Raup, R.B., Jr., 1953, Southwest district, in Search for and geology of radioactive deposits - Semiannual progress report, December 1, 1952 to May 31, 1953: U.S. Geological Survey, U.S. Atomic Energy Commission, Trace Elements Investigation Report TEI-330, p. 213-216.
Hill, J.M., 1946, Report on SOM investigations in Arizona (except the Plateau province area): U.S. Atomic Energy Commission Report RMO-26, 98 p., 20 sheets, various scales.
Adams, J.W., and Staatz, M.H., 1969, Rare earths and thorium, in Mineral and water resources of Arizona: Arizona Bureau of Mines Bulletin 180, p. 245-251.
Parker, R.L., 1969, Niobium and tantalum, in Mineral and water resources of Arizona: Arizona Bureau of Mines Bulletin 180, p. 238-242.
Norton, J.J., 1969, Lithium, in Mineral and water resources of Arizona: Arizona Bureau of Mines Bulletin 180, p. 206-211.
Schmitz, Christopher, and Burt, D.M., 1990, The Black Pearl Mine, Arizona; Wolframite veins and stockscheider pegmatite related to an albitic stock, in Stein, H.J., and Hannah, J.L., eds., Ore-bearing granite systems; Petrogenesis and mineralizing processes: Geological Society of America Special Paper 246, p. 221-232.