RESOURCES

1) http://www.nationsonline.org/oneworld/map/google_map_usa.htm
2) http://www.reserv-net.net/americas/maps/USA_Map1_on_Flag.jpg
3) http://wikitravel.org/en/United_States_of_America (location)
4) http://whc.unesco.org/en/list (places and cities, natural environment)
5) http://www.lonelyplanet.com/worldguide/usa/ (states)
6) http://www.usatourist.com/
7) http://www.usatravelguide.nl/
8) http://www.eusatravelguide.com/index.php?lang=en