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Chart of isogonic lines for the epoch 1930 according to Fisk [1931
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![Chart of isogonic lines for the epoch 1930 according to Fisk [1931](https://i2.wp.com/www.researchgate.net/profile/Sergey_Sokolov7/publication/270901816/figure/fig3/AS:667862788210690@1536242305353/Chart-of-isogonic-lines-for-the-epoch-1930-according-to-the-IGRF-11-model-showing-points_Q320.jpg)
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![Chart of isogonic lines for the epoch 1930 according to Fisk [1931](https://i2.wp.com/www.researchgate.net/profile/Sergey_Sokolov7/publication/270901816/figure/fig4/AS:667862788235265@1536242305374/Chart-of-anomalies-in-the-modulus-of-geomagnetic-field-strength-for-the-highlatitude-part_Q320.jpg)