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22. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania
23. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania
24. Cambrian and Precambrian rocks of the Groom district, Nevada, southern Great Basin
25. Cambrian and Precambrian rocks of the Groom district, Nevada, southern Great Basin
26. Cambrian rocks of the Pioche mining district, Nevada
27. Cambrian rocks of the Pioche mining district, Nevada
28. Correlation of the Cambrian rocks in New York State
29. Cambrian stratigraphy in southwestern Montana
30. Contribution à l'étude du Cambrien inférieur et du Precambrien III de l'Anti-Atlas marocain
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