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McDonald, G. 2006. Anza-Borrego and the Great American Biotic Interchange. In: G. Jefferson, L. Lindsay, Fossil Treasures of the Anza-Borrego Desert: The Last Seven Million Years. pp. 329-336.
Scott, E. 2006. Extinct horses and their relatives. In Jefferson, G. and L. Lindsay (eds), Fossil treasures of the Anza-Borrego Desert: the last seven million years. pp. 268-271.
(and where to view fossils in museums)