1. Big Sandy Formation near Wikieup, Mohave County, Arizona Author/Creator: Sheppard, Richard A., author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1972 Resource Type: Book Access & Availability: Loading
2. Big Sandy Formation near Wikieup, Mohave County, Arizona Author/Creator: Sheppard, Richard A. Publication/Creation: [Washington] : [U.S. Govt. Print. Off], [1972] Resource Type: Book Access & Availability: Loading
3. Biostratigraphy and paleoecology of the upper Miocene (Messinian) and lower Pliocene (?) Cerro de Almendral section, Almería Basin, southern Spain Author/Creator: Poore, Richard Z. Publication/Creation: Washington : U.S. Govt. Print. Off, 1981 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 773-779. Access & Availability: Loading
4. Biostratigraphy and paleoecology of the upper Miocene (Messinian) and lower Pliocene(?) Cerro de Almendral section, Almería Basin, southern Spain Author/Creator: Poore, Richard Z., author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1981 Resource Type: Book Access & Availability: Loading
5. The Bishop Ash Bed (Middle Pleistocene) and some older (Pliocene and Pleistocene) chemically and mineralogically similar ash beds in California, Nevada, and Utah Author/Creator: Izett, Glen Arthur, 1928- author Publication/Creation: [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1988 Resource Type: Book Access & Availability: Loading
6. The Bishop Ash Bed (Middle Pleistocene) and some older (Pliocene and Pleistocene) chemically and mineralogically similar ash beds in California, Nevada, and Utah Author/Creator: Izett, Glen Arthur, 1928- Publication/Creation: Washington : U.S. G.P.O. ; Denver, Co : For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1988 Resource Type: Book Access & Availability: Loading