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...ration, the sacking of Urgench is considered one of the [[List of wars and disasters by death toll#Individual battles and sieges|bloodiest massacres in human hi ...J.J. ''The History of the Mongol Conquests'', Routledge & Kegan Paul Ltd, 1971. (ISBN 0-8122-1766-7)

;[[Ninth Five-Year Plan (Soviet Union)|Ninth Five-Year Plan]] (1971–1975) ...]]. While having been known for his anti-communist rhetoric, Nixon said in 1971 that the U.S. "''must'' have relations with Communist China".{{sfn|Anderson

...uk/earth/earthnews/7554679/Aral-Sea-one-of-the-planets-worst-environmental-disasters.html|archivedate=April 8, 2010 <!--DASHBot-->|deadurl=no}}</ref><ref name=" ...[[Center for Nonproliferation Studies]]|work=Occasional Paper 1}}</ref> In 1971, weaponized smallpox from the island reached a nearby ship, which then allo

The '''Aral smallpox incident''' was a 1971 outbreak of the [[smallpox|viral disease]] which occurred as a result of a ...B. and R.A. Zilinskas,eds., ''[http://cns.miis.edu/opapers/op9/op9.pdf The 1971 Smallpox Epidemic in Aralsk, Kazakhstan, and the Soviet Biological Warfare