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https://www.noaa.gov/media/digital-library-photo/pl23cgs05975jpgDescription
Annual Report 1856. No. 62 Lines of Equal Magnetic Dip and Horizontal Intensityfor the Year 1850 (Image credit: United States Coast Survey Annual Report 1856)
Credit
United States Coast Survey Annual Report 1856
Display Date
1856
Collection
Historic Coast & Geodetic Survey
Historic Maps
United States Coast Survey Annual Report
Keywords
Historical Cartography