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2. Berberis and Mahonia;Ahrendt;Botanical Journal of the Linnean Society,1961
3. Some fossil species of Mahonia from the Tertiary of eastern and southeastern Oregon. Contributions from the Museum of Paleontology;Arnold,1936
4. The Miocene Trapper Creek flora of southern Idaho;Axelrod,1964
5. Miocene floras from the Middlegate Basin, West-Central Nevada;Axelrod,1985