Waverly Group

References

  1. Collins 1979, p. E4–E5.

Bibliography

  • Pepper, James F.; De Witt, Wallace, Jr.; Demarest, David F. (1954). "Geology of the Bedford Shale and Berea Sandstone in the Appalachian Basin" (PDF). United States Geological Survey. PMID 17842742. Retrieved February 1, 2018. Cite journal requires |journal= (help)CS1 maint: ref=harv (link)


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