pl23_cgs02223.jpg
![Calibrating magnetic instruments cgs02223.jpg Calibrating magnetic instruments](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs02223.jpg)
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https://www.noaa.gov/media/digital-library-photo/pl23cgs02223jpgDescription
Calibrating magnetic instruments
Display Date
1963 September
Collection
Historic Coast & Geodetic Survey
Keywords
Coast and Geodetic Survey
Geophysics Geomagnetism