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http://www.hospitalconnect.com/aha/resource_center/fastfacts/fast_facts_US_hospitals.html

Physician Characteristics and Distribution in the U.S., 2004 Edition and prior editions. American Medical Association.

http://www.dol.gov/wb/factsheets/Qf-nursing.htm

http://www.bls.gov/oco/ocos079.htm

http://www.keepmedia.com/ShowItemDetails.do?ema_id=36998&item_id=115261&oliID=176