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  1. Oligocene sedimentation, stratigraphy, paleoecology and paleoclimatology in the big Badlands of South Dakota [by] John Clark, James R. Beerbower [and] Kenneth K. Kietzke.
    By: Clark, John, - Beerbower, James R., - Kietzke, Kenneth K.,
    Publication info: [Chicago]Field Museum of Natural History,1967.
    Contributed by: University of Illinois Urbana Champaign
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