1. Stratigraphy and structure of Middle and Upper Ordovician rocks in the Sedgwick Basin and adjacent areas, south-central Kansas Author/Creator: Adkison, W. L., author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1972 Resource Type: Book Access & Availability: Loading
2. Stratigraphy and structure of Middle and Upper Ordovician rocks in the Sedgwick Basin and adjacent areas, south-central Kansas, Author/Creator: Adkison, W. L. Publication/Creation: Washington : U.S. Govt. Print. Off, 1972 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 702-704. Access & Availability: Loading
3. Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa Author/Creator: Agnew, Allen F., 1918-2012, author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1956 Resource Type: Book Access & Availability: Loading
4. Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa, Author/Creator: Agnew, Allen F., 1918-2012 Publication/Creation: Washington : U.S. Govt. Print. Off, 1956 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 274. Access & Availability: Loading
5. ... Zonation of the Middle and Upper Ordovician strata in northwestern Georgia Author/Creator: Allen, Arthur Thomas Publication/Creation: Altanta : [publisher not identified], 1957 Resource Type: Book Is Part Of: Bulletin (Geological Survey of Georgia), no. 64-68. Access & Availability: Loading
6. Eden Shale bryozoans: a numerical study (Ordovician, Ohio Valley) Author/Creator: Anstey, Robert L. Publication/Creation: East Lansing : [Museum, Michigan State University], 1972 [i.e. 1973] Resource Type: Book Access & Availability: Loading
7. Assessment of undiscovered oil and gas resources of the Ordovician Utica Shale of the Appalachian Basin Province, 2012 Publication/Creation: [Reston, Va.] : U. S. Department of the Interior, U.S. Geological Survey, 2012 Resource Type: Book Access & Availability: Loading
8. The Crinoidea of Anticosti Island, Québec (late Ordovician to early Silurian) Author/Creator: Ausich, William I. 1952- (William Irl) Publication/Creation: Calgary : Canadian Society of Petroleum Geologists, [2010] Resource Type: Book Access & Availability: Loading
9. The ordovician system in Canada : correlation chart and explanatory notes Author/Creator: Barnes, Christopher R. Publication/Creation: Ottawa : IUGS Secretariat, 1981 Resource Type: Book Access & Availability: Loading
10. The Paxton Group of southeastern New England Author/Creator: Barosh, Patrick J. 1936- (Patrick James), author Publication/Creation: [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1988 Resource Type: Book Access & Availability: Loading