[R-sig-Geo] missing county in maps

[stubben]

Hi,

I 'm trying to color a county map of New Mexico based on some data I  
have - however, I have one extra county, Cibola, which is not in the  
county maps (v 2.1-0) database.  This county was created in 1981 by  
splitting the existing Valencia county in two.  Is there an easy way  
to  split the existing polygon in the county database or some other  
workaround?

#32 counties (Cibola is missing)
map.text("county", "new mexico")

Thanks,

Chris Stubben