Tosdal, R.M., Eppinger, R.G., Blank, H.R., Jr., Knepper, D.H., Jr., Gallagher, A.G., Pitkin, J.A., Jones, S.L., and Ryan, G.S., 1990, Mineral resources of the Swansea Wilderness Study Areas, La Paz and Mohave Counties, Arizona, Chapter C, in Mineral resources of Wilderness Study Areas: Havasu region, Arizona: U.S. Geological Survey Bulletin 1704-C, p. C1-C24.