Ann Arbor: University of Michigan, 1980. Commemoirating the 100th anniversary of J. L. Wortman's Discovery of fossil mamals in the Bighorn Basin. vi, 146p., maps, b/w illus., original stiff printed wrappers, quarto format (University of Michigan Museum of Paleontology. Papers on paleontology, 24). (Inventory #: 046902)
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