I have been using the "map" function in R and I was wondering if there is a way 
to map multi-state regions just showing the outline of the region without 
interior state borders.  For instance, I am calculating aggregated statistics 
using 10 multi-state regions.  I would like to color-code individual states 
based on my dataset but then to create black outlines around each of these 10 
regions so that the map shows the delineations of the various regions for which 
I am reporting aggregated statistics.
When I use:
map('state', region = "Idaho", "Washington", "Oregon", add = TRUE, color = 
"black")
I get a plot that includes interior boundaries between these 3 states instead 
of an exterior border around this region.

Thanks,
Heather

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