http://www.ducksters.com/geography/usgeography.php
http://www.sheppardsoftware.com/web_games.htm
http://www.factmonster.com/us.html
http://kids.nationalgeographic.com/content/kids/en_US/explore/countries/united-states/
http://regions.mrdonn.org/usa.html
http://www.kathimitchell.com/reggeo.html
http://www.kidskonnect.com/subjectindex/28-places/geography/415-great-lakes.html
http://www.livescience.com/29312-great-lakes.html
http://www.thefreeresource.com/facts-about-the-saint-lawrence-river-for-kids
http://traveltips.usatoday.com/10-great-basin-desert-101867.html
http://atlanticcoastalplain.wikispaces.com/
http://www.epa.gov/gmpo/about/facts.html
http://www.philadelphiacitywebsite.com/Philadelphia_City_Pennsylvania_local_history_facts_archive_preservation_records_museum_exhibit_PA.html
http://www.nps.gov/deva/forteachers/loader.cfm?csModule=security/getfile&PageID=410260
http://washington.org/DC-information/washington-dc-quick-facts-kids
http://www.50states.com/facts/penn.htm#.U_X02MVdWSo