Sources & Special Thanks for the United States of America
Bibliographical Resources
-Centers for Disease Control & Prevention (www.cdc.gov)
-Encyclopedia Britannica. United States of America. DVD. 2004.
-Hudson, John C, and Edward B Espenshade, Jr., ed. Goode's World Atlas, 20th Edition. Rand McNally. 1995.
-McKnight, Tom, ed. Geographica: The Complete Illustrated Atlas of the World. Barnes & Noble, Inc. 2002.
-PubMed (www.ncbi.nlm.nih.gov/pubmedhealth/)
-www.albireo.ch
-www.cia.gov/library/publications/the-world-factbook/
-www.nationsencyclopedia.com
-www.weather.com
-www.wikipedia.org