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via-declination-of-the-earth-1590-1990

(via Declination of the Earth 1590-1990)


Date posted: 2015/05/12 10:05:46
Date liked: 2015/05/12 17:05:08
3 Tumblr notes
Liked from: Dan W, Software Developer
Originally posted from: geomag.usgs.gov
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