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1
Subsurface projection of Cambro-Ordovician sediments in the Pennsylvania-New York region.
by Swartz, Frank M. 1899-1982.
Published 1950
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2
Geology and hydrology of the Martinsburg formation in Dauphin County, Pennsylvania /
by Carswell, Louis D.
Published 1968
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3
The Utica and Lorraine formations of New York /
by Ruedemann, Rudolf, 1864-1956.
Published 1925
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7
Upper Ordovician formations in Ontario and Quebec /
by Foerste, Aug. F. 1862-1936.
Published 1916
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8
Beekmantown group : Lower Ordovician, of Maryland.
by Sando, William Jasper.
Published 1957
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10
Lower Silurian system of eastern Montgomery County, New York /
by Cumings, E. R. 1874-1967.
Published 1900
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11
The Lower Siluric shales of the Mohawk valley /
by Ruedemann, Rudolf, 1864-1956.
Published 1912
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12
Cloridorme formation, Middle Ordovician flysch : northern Gaspé Peninsula, Quebec.
by Enos, Paul, 1934-
Published 1969
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13
Ordovician K-bentonites of eastern North America /
by Kolata, Dennis R.
Published 1996
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14
Contributions to the study of the Ordovician of Ontario and Quebec /
by Wilson, Alice E. 1881-1964.
Published 1936
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15
The Canadian and Ordovician formations and fossils of South Manchuria /
by Endo, Riuji.
Published 1932
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16
Hudson River beds near Albany and their taxonomic equivalents /
by Ruedemann, Rudolf, 1864-1956.
Published 1901
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