Annual Report 1857. No. 68 Diagrams to illustrate the gradual loss of Magnetism of the several Magnets in use in the survey of the coast between the years 1845 and 1857.
Image ID: cgs06047, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1857 Credit: United States Coast Survey Annual Report 1857 Category: Historical Cartography/ • High Resolution Photo Available
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