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Some example datasets of historical tree distributions, from "Atlas of United States Trees" by Elbert L. Little, Jr.
SpatialPolygonDataFrame
Historical range map for the noble fir (Abies procera)
Historical range map for the Oregon white oak (Quercus garryana)
Historical range map for the coast redwood (Sequoia sempervirens)
climdat.hist, climdat.fut
climdat.hist
climdat.fut