Peterson, J.A., Hassemer, J.R., Knepper, D.H., Jr., Pitkin, J.A., Hanna, W.F., and McDonnell, J.R., Jr., 1989, Mineral resources of the Woolsey Peak Wilderness Study Area, Maricopa County, Arizona, Chapter F, in Mineral resources of Wilderness Study Areas: Southwestern and south-central Arizona: U.S. Geological Survey Bulletin 1702-F, p. F1-F16.