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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 rocks of the Pioche mining district, Nevada
25. Cambrian rocks of the Pioche mining district, Nevada
26. Cambrian trilobites of east-central Alaska
27. Cambrian trilobites of east-central Alaska,
28. The central Virginia volcanic-plutonic belt : an island arc of Cambrian(?) age
29. The central Virginia volcanic-plutonic belt : an island arc of Cambrian age
30. Cambrian Merostomata
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