File:EB1911 - Magnetism, Terrestrial - Fig. 1.—Isogonals, or lines of equal magnetic declination.jpg
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![File:EB1911 - Magnetism, Terrestrial - Fig. 1.—Isogonals, or lines of equal magnetic declination.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/9/98/EB1911_-_Magnetism%2C_Terrestrial_-_Fig._1.%E2%80%94Isogonals%2C_or_lines_of_equal_magnetic_declination.jpg/800px-EB1911_-_Magnetism%2C_Terrestrial_-_Fig._1.%E2%80%94Isogonals%2C_or_lines_of_equal_magnetic_declination.jpg)
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current | 00:54, 27 December 2020 | ![]() | 1,061 × 513 (573 KB) | DivermanAU | Uploaded a work by Emery Walker from ''Encyclopædia Britannica'' (11th ed.), v. 17, 1911, "Magnetism, Terrestrial" article, pp. 356 ff. Modified from https://www.gutenberg.org/files/43060/43060-h/43060-h.htm#ar107 with UploadWizard |
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