[R-sig-Geo] Creating a map with metropolitan areas

[Rolando Valdez]

Hi,

I'm new in this list, and new in the R environment. I'm trying to plot a map
with the index localization by metropolitan area.

I have a .shp with states (32 obs); 

https://skydrive.live.com/redir?resid=C319779BEF3A0241!1369&authkey=!AGj5MTC
l0waT_w0&v=3&ithint=photo%2c.png

then, I have a .shp with municipalities (2454 obs);

https://skydrive.live.com/redir?resid=C319779BEF3A0241!1370&authkey=!AFhsFOZ
_kERbGKA&v=3&ithint=photo%2c.png

then, I have the index localization by municipalities (345 municipalities)
grouped in metropolitan areas and I need to plot something like this map:

https://skydrive.live.com/redir?resid=C319779BEF3A0241!1364&authkey=!AEki9Sa
DxCfPmy8&v=3&ithint=photo%2c.jpg

I hope you can help me.

Regards,

Rolando