Cooper, J.R., 1959, Reconnaissance geologic map of southeastern Cochise County, Arizona: U.S. Geological Survey Mineral Investigations Field Studies Map MF-213, 1 sheet, scale 1:125,000.
Coates, D.R., and Cushman, R.L., 1955, Geology and ground-water resources of the Douglas basin, with a section on Chemical quality of the ground water, by J.L. Hatchett: U.S. Geological Survey Water-Supply Paper 1354, 56 p., 5 sheets, scale 1:211,000.
Bull, W.B., 1984, Alluvial fans and pediments of southern Arizona, in Smiley, T.L., Nations, J.D., Pewe, T.L., and Schafer, J.P., eds., Landscapes of Arizona - The geological story: Lanham, Md., University Press of America, p. 229-252.
Bryant, D.L., 1968, Diagnostic characteristics of the Paleozoic formations of southeastern Arizona, in Titley, S.R., ed., Southern Arizona Guidebook III: Arizona Geological Society, p. 33-47.
Boyd, D.T., 1978, Stratigraphic relations within the Devonian Martin, Swisshelm, and Portal formations of Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 76 p.
Armin, R.A., 1985, Red chert-clast conglomerate in the Earp Formation (Pennsylvanian-Permian), southeastern Arizona: Stratigraphy, sedimentology, and tectonic significance: Tucson, University of Arizona, Ph.D. dissertation, 338 p.
Arizona Bureau of Mines, 1959, Geologic map of Cochise County, Arizona: Arizona Bureau of Mines, 1 sheet, scale 1;375,000 [now available as Arizona Geological Survey Map M-3-1].
Arizona Bureau of Mines, 1951, Arizona zinc and lead deposits, Part II: Arizona Bureau of Mines Bulletin no. 158, 118 p.
Andreasen, G.E., Mitchell, C.M., and Tyson, N.S., 1965, Aeromagnetic map of Tombstone and vicinity, Cochise and Santa Cruz Counties, Arizona: U.S. Geological Survey Open-File Report (Geophysical Investigations Preliminary Map), 1 sheet, scale 1:125,000.