pl23_theb1299.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1299jpgDescription
Making magnetic observations for declination.
Credit
Merchant Marine Bulletin, September 1931, p. 19
Display Date
1931
Location
Washington, D.C. area
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Geomagnetism