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1
The Ordovician system in Canada : correlation chart and explanatory text/
by Barnes, Christopher R.
Ottawa : International Union of Geological Sciences, 1981

Book
2
The ordovician system in Canada : correlation chart and explanatory notes /
by Barnes, Christopher R.
Ottawa, Ont. : Available from IUGS Secretariat, 1981

Book
3
Preliminary studies of the ultrastructure of selected Ordovician conodonts
by Barnes, Christopher R., Sass, Daniel B., Monroe, Eugene A.
[Toronto] Royal Ontario Museum, 1970

Book
4
The Ordovician system in Canada : correlation chart and explanatory text /
by Barnes, Christopher R.
Ottawa : IUGS Secretariat, 1981

Book
5
Advances in Ordovician geology /
[Ottawa] : Energy, Mines, and Resources Canada, 1991

Book
6
Lower Ordovician conodonts of the St. George Group, Port au Port Peninsula, western Newfoundland, Canada /
by Ji, Zailiang
Calgary, Alta. : St, John's, Nfld. : Canadian Society of Petroleum Geologists ; Geological Association of Canada, 1994

Book
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