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  • American Veterinary Medical Association. "Backgrounder: Plague."
  • BBC News. "China steps up 'one child' policy." Sept. 25, 2000.
  • Bishop, Rebecca A. "The History of Bubonic Plague."
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  • "Chinese witness: Beijing forces sterilizations, abortions." June 11, 1998.
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  • Longman, Phillip. The Empty Cradle. Basic Books, April 13, 2004.
  • NASA. "Population Density."
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  • U.S. Census Bureau. "FAQ - How DO You Define Race?"­p_faqid=263&p_created=1077639822&p_sid=YxkyU2Si&p_accessibility­=0&p_redirect=&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2d­yaWRzb3J0PSZwX3Jvd19jbnQ9MjU0LDI1NCZwX3Byb2
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