1. Upper Ordovician and Silurian stratigraphy in Sequatchie Valley and parts of the adjacent valley and ridge, Tennessee Author/Creator: Milici, Robert C., 1931- Publication/Creation: Washington : U.S. Govt. Print. Off, 1977 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 995-999. Access & Availability: Loading
2. Upper Silurian and Lower Devonian stratigraphy of northeastern Pennsylvania, New Jersey, and southeasternmost New York Publication/Creation: Washington : U.S. Govt. Print. Off, 1967 Resource Type: Book Is Part Of: U.S. Geological Survey bulletin, no.1243-1244. Access & Availability: Loading
3. Upper Silurian and Lower Devonian stratigraphy of the Central Illinois Basin Author/Creator: Droste, John Brown, 1927- Publication/Creation: Bloomington, Ind. : State of Indiana, Dept. of Natural Resources, Geological Survey, 1987, 1987 Resource Type: Book Access & Availability: Loading
4. Upper Silurian brachiopods from southeastern Alaska, Author/Creator: Kirk, Edwin, 1884-1955 Publication/Creation: Washington : U.S. Govt. Print. Off, 1952 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 233 A-E. Access & Availability: Loading
5. Upper Wenlock (Silurian) graptolites of Arctic Canada : pre-extinction, lundgreni biozone fauna Author/Creator: Lenz, Alfred C., 1929- Publication/Creation: Calgary : Canadian Society of Petroleum Geologists ; St. John's, Nfld. : Geological Association of Canada, 2001 Resource Type: Book Access & Availability: Loading
6. Uppermost Clinton (Middle Silurian) stratigraphy and petrology, east-central New York Author/Creator: Zenger, Donald H. Publication/Creation: Albany : University of the State of New York, 1971 Resource Type: Book Is Part Of: Museum bulletin (New York State Museum), no. 412-417. Access & Availability: Loading