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Correlation Charts [of the Post-Proterozoic Sedimentary Formations of North America]: Introduction. 1. Cambrian. 2. Ordovician. 3. Silurian. 4. Devonian. 5. Mississippian. 6. Pennsylvanian. 7. Permian

National Research Council (U.S.). Committee on StratigraphyCarl Owen Dunbar

出版	Geological Society of America, 1942
URL	http://books.google.com.hk/books?id=iG85p1-rUREC&hl=&source=gbs_api