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NOAA Photo Library Image - cgs00732

Iso-magnetic lines showing change in declination for Pennsylvania between 1842 and 1862 and other magnetic parameters as compiled by A.D. Bache.

Image ID: cgs00732, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Pennsylvania
Photo Date: 1863
Credit: NOAA Central Library Historical Imagery

• High Resolution Photo Available




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Last Updated: April 30, 2013