An object of class 'SpatialPolygonsDataFrame' that was created from a
shapefile of the U.S. level 3 ecoregion boundaries.
The format is:
Formal class 'SpatialPointsDataFrame' [package "sp"].
This is just an example data set.
spplot(WSA3, zcol="WSA_3_NM", col.regions=rainbow(3, s=0.75))
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