1. Contributions to the Ordovician paleontology of Kentucky and nearby states Publication/Creation: For sale by the Supt. of Docs., U.S. Govt. Print. Off Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 1066 A-N. Access & Availability: Loading
2. Contributions to the Ordovician paleontology of Kentucky and nearby states Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1979 Resource Type: Book Access & Availability: Loading
3. Cambrian and Ordovician rocks of southern Arizona and New Mexico and westernmost Texas Author/Creator: Hayes, Philip T. 1923- (Philip Thayer), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1975 Resource Type: Book Access & Availability: Loading
4. Cambrian and Ordovician rocks of southern Arizona and New Mexico and westernmost Texas Author/Creator: Hayes, Philip T. 1923- (Philip Thayer) Publication/Creation: Washington : U.S. Govt. Print. Off, 1975 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no.871-879. Access & Availability: Loading
5. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania Author/Creator: Meisler, Harold, author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1968 Resource Type: Book Access & Availability: Loading
6. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania Author/Creator: Meisler, Harold Publication/Creation: [Washington] : [U.S. Govt. Print. Off], [1968] Resource Type: Book Is Part Of: U.S. Geological Survey bulletin, no.1253-1256. Access & Availability: Loading
7. Composition, clay mineralogy, and diagenesis of the Simpson Group (Middle Ordovician), Grady County, Oklahoma Author/Creator: Pollastro, Richard M., author Publication/Creation: [Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1991 Resource Type: Book Access & Availability: Loading
8. Calymenid and other Ordovician trilobites from Kentucky and Ohio Author/Creator: Ross, Reuben James, 1918- Publication/Creation: Washington : U.S. Govt. Print. Off, 1967 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 581-584. Access & Availability: Loading
9. Conodonts of the Trenton group (Ordovician) in New York, Southern Ontario, and Quebec Author/Creator: Schopf, Thomas J. M. Publication/Creation: Albany : University of the State of New York, 1966 Resource Type: Book Is Part Of: Museum bulletin (New York State Museum), no. 402-407. Access & Availability: Loading
10. The Chopawamsic Formation-- : a new stratigraphic unit in the Piedmont of northeastern Virginia Author/Creator: Southwick, D. L. 1936- (David Leroy), author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1971 Resource Type: Book Access & Availability: Loading