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Medina, E., E.H. Helmer, Elvia J. Melendez-Ackerman, and M. Humpredo. "Natural Vegetation Groups and Canopy Chemical Markers in a Dry Subtropical Forest on Calcareous Substrate: The Vegetation of Mona Island, Puerto Rico." Caribbean Naturalist 13 (2014): 1-15.
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Melendez-Ackerman, Elvia J., E.H. Helmer, and T.J. Brandeis. Forest vegetation cover assessment on Mona Island, Puerto Rico. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station, 2012.