Map showing lines of equal magnetic declination and of equal annual change
as determined by the Coast and Geodetic Survey in 1935.
Image ID: cgs00123, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1935 Ca.
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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May 12, 2014