Northeast

http://www.geocities.com/pegmihedu/Regions.html

http://www.nps.gov/nero/

http://www.fws.gov/northeast/white_nose.html

http://en.wikipedia.org/wiki/Northeastern_United_States

Southeast

http://www.fws.gov/southeast/

http://weathereye.kgan.com/cadet/climate/climate_southeast.html

Midwest

http://www.emints.org/ethemes/resources/S00000399.shtml

http://usa.usembassy.de/travel-regions.htm

http://www.toeflaccess.com/articles/ETS/archive/us/living/learn_midwest.html

http://weathereye.kgan.com/cadet/climate/climate_midwest.html

West

http://www.emints.org/ethemes/resources/S00000574.shtml

http://www.britannica.com/EBchecked/topic/640030/the-West

http://en.wikipedia.org/wiki/Western_United_States

Southwest

http://www.fws.gov/southwest/

http://cg043.k12.sd.us/regions%20of%20the%20US%20webquest/southwest_region.htm

http://en.wikipedia.org/wiki/Southwestern_United_States

http://library.thinkquest.org/4552/newpage4.htm