Annual Report 1861. No. 30 Lines of Equal Magnetic Declination on the Gulf of Mexico for the Epoch 1860. Lines of Equal Magnetic Declination on the Atlantic Coast Virginia to Florida for the Epoch 1860.
Image ID: cgs06189, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1861 Credit: United States Coast Survey Annual Report 1861 • High Resolution Photo Available
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