2011年龍捲風災 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "2011年龍捲風災" in Chinese language version.

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noaa.gov

U.S. Annual Tornado Maps (1952 - 2011). Storm Prediction Center. National Oceanic and Atmospheric Administration. [2015-05-10]. （原始内容存档于2020-11-12）.
United States Tornadoes of 2012 (PDF). Storm Prediction Center. [2013-01-13]. （原始内容存档 (PDF)于2020-09-26）.
2011 U.S. Killer Tornado Statistics. Storm Prediction Center. National Oceanic and Atmospheric Administration. [2014-12-26]. （原始内容存档于2020-11-12）.

NCDC Storm Events Database. National Climatic Data Center. 2011 [2011-06-24]. （原始内容存档于2011-05-05）.

U.S. Annual Tornado Maps (1952 - 2011). Storm Prediction Center. National Oceanic and Atmospheric Administration. [2015-05-10]. （原始内容存档于2020-11-12）.
United States Tornadoes of 2012 (PDF). Storm Prediction Center. [2013-01-13]. （原始内容存档 (PDF)于2020-09-26）.
NCDC Storm Events Database. National Climatic Data Center. 2011 [2011-06-24]. （原始内容存档于2011-05-05）.
2011 U.S. Killer Tornado Statistics. Storm Prediction Center. National Oceanic and Atmospheric Administration. [2014-12-26]. （原始内容存档于2020-11-12）.
龍捲風襲美死亡人數持續攀升（2011年4月30日星島日報）. [2011年4月30日]. （原始内容存档于2011年5月4日）.