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To find out more about Barter Books visit http://www.barterbooks.co.uk to download the 'Keep Calm' iphone app visit http://bit.ly/keepcalmapp A short film that tells the story behind the 'Keep Calm and Carry On' poster. Its origins at the beginning of WWII and its rediscovery in a bookshop in England in 2000, becoming one of the iconic images of the 21st century.