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本图原来发表于Flickr,作者为National Maritime Museum,网址为https://www.flickr.com/photos/11334970@N05/4793354496;经FlickreviewR于23:15, 7 November 2010 (UTC)审查后,确认本图以No known copyright restrictions释出,相容于维基共享资源。然而上述的授权条款与来源处不同,因而无法确定本页所提供的授权条款是否有效。