The Early Permian ageof the Dunkard Group,Appalachian basin,U.S.A., based onspiloblattinid insectbiostratigraphy Jörg W. SchneiderSpencer G. LucasJames E. Barrick2013 год

The Early Permian age of the Dunkard Group, Appalachian basin, U.S.A., based on spiloblattinid insect biostratigraphy
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