Kirkpatrick Catalogue entry: "2428 Evans, Sir F.J.O. Chart of the curves of equal magnetic variation, 1858. London, Admiralty, 1858. 1 sheet. [see p.]." Submap: Index Chart, showing the approximate Annual Change of the Magnetic Variation for the Epoch 1858.. Prime meridian: GM. Relief: no. Projection: Mercator. Printing Process: Lithography. Other Features: Sub-maps. References: From the library of Sir Richard Francis Burton, 1821-1890..
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