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B441 (2020) 131 pp. Neil H. Landman, W. James Kennedy, Joyce Grier, Neal L. Larson, James W. Grier, Thomas Linn, Lydia Tackett, Brian R. Jicha. Large scaphitid ammonites (Hoploscaphites) from the Upper Cretaceous (upper Campanian-lower Maastrichtian) of North America : endless variation on a single theme.
