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    Old stone walls record the changing location of magnetic north
    From: Jackson McDonald
    Date: 2019 Mar 12, 13:22 +0000

    More about surveying than navigation, but interesting nonetheless. 
    
    http://theconversation.com/old-stone-walls-record-the-changing-location-of-magnetic-north-112827
    
    JMcD
    
    
    

       
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