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Trailer: National Geographic's 'Doomsday Preppers'

Braxton Southwick is preparing for a biological terrorist attack.

http://www.wbir.com/video/1966380599001/1/Trailer-National-Geographics-Doomsday-Preppers http://videos.usatoday.net/Brightcove2/29906170001/2012/11/29906170001_1965492106001_ari-origin05-arc-139-1352818622861.jpg?pubId=29906170001 Trailer: National Geographic's 'Doomsday Preppers' Braxton Southwick is preparing for a biological terrorist attack. 01:24

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