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Description: | Vertical air photography is used by the Ordnance Survey to update changing topgraphical features on mapping. This 1994 image from an Ordnance Survey flight over low-lying marshland in Kent shows evidence of drainage channels, sea defences and possible former salt workings through soilmark evidence. | Subjects: | Agriculture Field System Aerial View Landscape | Source: | English Heritage - Viewfinder | Identifier: | http://viewfinder.english-heritage.org.u... | Language: | en | Go to resource |
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