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Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1920)

Trees and shrubs of Mexico - Standley, Paul Carpenter, 1884 -1963 (Govt. Print. Off, 1924)

Trees and shrubs of Mexico - Standley, Paul Carpenter, 1884 -1963 (Govt. Print. Off, 1924)