[R] Drawing maps in R?

[Spencer Graves]

     What tools and documentation exist for producing maps and working 
with polygon and polylist objects in R beyond the following: 

     * Packages maps, mapproj, maptools, and mapdata. 

     * Becker and Wilks (1993, 1995), listed as references in the 
documentation on the "map" function. 

     Thanks,
     Spencer Graves
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