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OA Guide to Map & Compass - Part 2
CBG San on Twitter: "#CBG_Thread North wasn't always North. It was South once. Thread about Earth's fickle magnetic poles, their constant shift & eventual reversal !! And how old terracotta pots hold
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Which Way is North, Really? - maxgeo
Magnetic Declination Varies Considerably Across The United States | U.S. Geological Survey
