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201
Champlainian series (Middle Ordovician) in Illinois /
by Templeton, Justus Stevens, 1914-
Urbana : State Geological Survey, 1963

Book
203
Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Morrow County, Ohio, to Pendleton County, West Virginia /
by Ryder, Robert T.
[Washington D.C.] : Denver, CO : U.S. G.P.O. ; For sale by Book and Open-File Report Sales, U.S. Geological Survey, 1992

Government Document Book
204
Stratigraphy and structure of Middle and Upper Ordovician rocks in the Sedgwick Basin and adjacent areas, south-central Kansas
by Adkison, W. L.
Washington, U.S. Govt. Print. Off., 1972

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Government Document Book
205
The Trenton group (Upper Ordovician series) of eastern North America : deposition, diagenesis, and petroleum /
Tulsa, Okla., U.S.A. : American Association of Petroleum Geologists, 1989

Book
206
Morphologic and systematic relationships of some Middle Ordovician Ostracoda.
by Kraft, John C. (John Christian)
New York, Geological Society of America, 1962

Book
208
Simpson Group (Middle Ordovician) trilobites of Oklahoma /
by Shaw, Frederick Carleton
[s.l.] : Paleontological Society, 1974

Book
209
The Ordovician system in most of Russian Asia : correlation charts and explanatory notes /
Trondheim, Norway : Ottawa, Ont., Canada : IUGS Secretariat ; IUGS Editorial Office, 1988

Book
210
The Ordovician system in the Near and Middle East : correlation chart and explanatory notes /
by Dean, William Thornton
Ottawa, Ont. Canada : Available from IUGS Secretariat, 1980

Book
212
The ordovician system in Canada : correlation chart and explanatory notes /
by Barnes, Christopher R.
Ottawa, Ont. : Available from IUGS Secretariat, 1981

Book
213
Microorganismes de l'ordovicien de Pologne (Mikroorganizmy z ordowiku Polsik).
by Górka, Hanna
Warszawa, Państwowe Wydawn. Naukowe, 1969

Book
214
Tectonics and Cambrian-Ordovician stratigraphy in the Central Appalachians of Pennsylvania /
[Pittsburgh] : Pittsburgh Geological Society, 1963

Book
215
The Taconian clastic sequence in northern Virginia and West Virginia /
[S.l.] : Society of Economic Paleontoogists and Mineralogists, Eastern Section, 1985

Book
216
Upper Ordovician and Silurian stratigraphy in Sequatchie Valley and parts of the adjacent valley and ridge, Tennessee /
by Milici, Robert C., 1931-
Washington : U.S. Govt. Print. Off., 1977

Government Document Book
217
Ultrastructural studies on graptolites
by Urbanek, Adam, Towe, Kenneth M.
Washington, Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.] 1974

Government Document Book
218
Ordovician trilobites of Argentina,
by Harrington, Horacio Jaime, 1910-, Leanza, Armando F.
Lawrence, University of Kansas Press, 1957

Book
219
Geological map (22 H, 12E, F) and notes on the Ordovician and Silurian litho- and biostratigraphy, Anticosti Island, Quebec
by Bolton, Thomas Elwood, 1924-
[Ottawa] Dept. of Energy, Mines and Resources 1972

Government Document Book
220
Ordovician trilobites from the central volcanic mobile belt at New World Island, northeastern Newfoundland,
by Dean, William Thornton
[Ottawa] Dept. of Energy, Mines and Resources 1971

Government Document Book
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