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22. The Cambrian-Ordovician boundary : sections, fossil dis-tributions and correlations
23. Cambro-Ordovician strata in northwest Georgia and southeast Tennessee, the Knox Group and the Sequatchie Formation
24. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania
25. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania
26. The central Virginia volcanic-plutonic belt : an island arc of Cambrian(?) age
27. The central Virginia volcanic-plutonic belt : an island arc of Cambrian age
28. The Chopawamsic Formation-- : a new stratigraphic unit in the Piedmont of northeastern Virginia
29. The Chopawamsic Formation-- : a new stratigraphic unit in the Piedmont of northeastern Virginia
30. Contribution à l'étude du Cambrien inférieur et du Precambrien III de l'Anti-Atlas marocain
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