pl23_theb1304.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1304jpg-0Description
Using compass declinometer for magnetic observations.Lt. Benjamin H. Rigg observing.Accompanied MacMillan Arctic Expedition.
Credit
C&GS; Season's Report Rigg 1926-69
Display Date
1926
Location
Greenland
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Geomagnetism