Preston The Commonness And Rarity Of Species ~REPACK~
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Altonen, T. A. and Vitikainen, J. L. 2009. Naturally Rare Vascular Plant Species in Finland: Classification and Rarity. Helsinki, University of Helsinki, Department of Botany. http://www.helsinki.fi/isbn/978-951-8842-4-3.
Hättenschwiler, M. F. and Sistla, G. M. 1997. Rarity. In Ecology of Southwestern Virginia: A Natural History. U.S. Geological Survey Scientific Investigations Report. 1997-2899 (1-2), pp. 52-63.
Wright, D. M. and Meffe, M. 2008. Vascular Plant Rarity in Southwestern Minnesota: An Introduction. Thesis, Department of Biology, University of Minnesota, St. Paul, MN. http://hdl.handle.net/1903/28926. 827ec27edc