1. Geochemistry of the Cambrian-Ordovician aquifer system in the northern Midwest, United States Author/Creator: Siegel, Donald I. Publication/Creation: Denver, CO : For sale by the Books and Open-File Reports Section, U.S. Geological Survey Resource Type: Book Access & Availability: Loading
2. Geologic, geochemical, and isotopic studies of a carbonate- and siliciclastic-hosted Pb-Zn deposit at Lion Hill, Vermont Publication/Creation: Denver, CO : For sale by U.S. Geological Survey, Information Services Resource Type: Book Access & Availability: Loading
3. Geology, hydrology, and water quality of the Cambrian and Ordovician systems in northern Illinois Author/Creator: Visocky, A. P. (Adrian P.) Publication/Creation: Champaign, Ill. : State of Illinois, Dept. of Energy and Natural Resources, 1985 Resource Type: Book Access & Availability: Loading
4. Graptolites from the Upper Ordovician and Lower Silurian of Jordan Author/Creator: Loydell, David K. Publication/Creation: London : Palaeontological Association, [2007] Resource Type: Book Access & Availability: Loading
5. A guide to the stratigraphy of the Chickamauga supergroup in its type area Author/Creator: Milici, Robert C., 1931- Publication/Creation: Atlanta : Georgia Dept. of Mines, Mining and Geology, 1969 Resource Type: Book Access & Availability: Loading