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2. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania
3. Carbonate rocks of Cambrian and Ordovician age in the Lancaster quadrangle, Pennsylvania
4. The Chopawamsic Formation-- : a new stratigraphic unit in the Piedmont of northeastern Virginia
5. The Chopawamsic Formation-- : a new stratigraphic unit in the Piedmont of northeastern Virginia
6. Stratigraphic nomenclature of Cambrian and Lower Ordovician rocks of eastern-most southern Arizona and adjacent western-most New Mexico
7. Stratigraphic nomenclature of Cambrian and Lower Ordovician rocks of easternmost southern Arizona and adjacent westernmost New Mexico
8. Systematics, environment, and biogeography of some late Cambrian and early Ordovician trilobites from eastern New York State,
9. Systematics, environment, and biogeography of some late Cambrian and early Ordovician trilobites from eastern New York State
10. Cambrian and Ordovician rocks of southern Arizona and New Mexico and westernmost Texas
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