Detailed information for reference 32335Bishop, G.A. (1981) Occurence and fossilization of Dakoticancer assemblage, Upper Cretaceous Pierre Shale, South Dakota. In: Gray, J., A.J. Boucot, and W.B.N. Berry (eds.) Communities of the past. Stroudsburg, PA: Hutchinson Ross Publishing Co.. Pp. 383–413. PDF is 12MB
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