pl23_cgs06327.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23cgs06327jpgDescription
No. 28. Curves of Equal Annual Change of Magnetic Declination In theeastern part of the United States, for the period 1860 to 1870. + indicatesincreasing west declination. Oct. 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