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Six Charts Showing Biostratigraphic Zones, and Correlations Based on Conodonts from the Devonian and Mississippian Rocks of the Upper Mississippi Valley

Charles William CollinsonDaniel L. DeadmoreJames C. BradburyJohn Chapman FryeLyle David McGinnisRichard Henry HowardRobert Louis EisslerThomas Gregory PerryWalter Edward ParhamWayne Arthur PryorWillis L. BuschHerbert David GlassJames Stewart MachinJohn Paul KemptonHarold Bowen Willman

出版	Illinois State Geological Survey, 1961
URL	http://books.google.com.hk/books?id=b0iLT6QQxvEC&hl=&source=gbs_api