pl23_cgs06326.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23cgs06326jpgDescription
No. 27. Magnetic Declination (Variation of the Compass) Isogonic Linesfor the Year 1870. (U. S. Coast Survey Office 1865.) 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