Epis, R.C., Gilbert, C.M., and Langenheim, R.L., 1957, Upper Devonian Swisshelm Formation of southeastern Arizona: American Association of Petroleum Geologists Bulletin, v. 41, no. 10, p. 2243-2256.
Epis, R.C., Gilbert, C.M., and Langenheim, R.L.
American Association of Petroleum Geologists Bulletin, v. 41, no. 10, p. 2243-2256.
Correlation, Physical Stratigraphy, Sedimentary, Locale, Swisshelm Fm - Devonian,
