pl23_theb1311.jpg
![Chart showing isogonic lines for year 1900 theb1311.jpg Chart showing isogonic lines for year 1900](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1311.jpg)
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https://www.noaa.gov/media/digital-library-photo/pl23theb1311jpg-0Description
Chart showing isogonic lines for year 1900.Isogonic lines are lines of equal declination
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Geomagnetism