Dear Kevin,
You might find this Mathematica.SE answer useful which I recieved for one of my similar questions:
http://mathematica.stackexchange.com/a/3648/89
In a nutshell: "Polygon" only gives the main boundaries of a country, an as such, "Polygon" is not the direct simplification of "FullPolygon", as it omits certain parts. Use "FullPolygon" for all boundaries (though be prepared that it takes more time as it uses much more polygon points).
Istvan
On Tuesday, May 1, 2012 10:24:54 AM UTC+1, Kevin J. McCann wrote: