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https://www.noaa.gov/media/digital-library-photo/pl23cgs06326jpg-0Description
No. 27. Magnetic Declination (Variation of the Compass) Isogonic Linesfor the Year 1870. (U. S. Coast Survey Office 1865.) Annual Report 1865. (Image credit: United States Coast Survey Annual Report 1865)
Credit
United States Coast Survey Annual Report 1865
Display Date
1865
Collection
Historic Coast & Geodetic Survey
Historic Maps
United States Coast Survey Annual Report
Keywords
Historical Cartography