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![Geomagnetic observatories that were putting hourly values in machine-readableform prior to the International Geophysical Year cgs02140.jpg Geomagnetic observatories that were putting hourly values in machine-readableform prior to the International Geophysical Year](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs02140.jpg?itok=QTF46AUl)
Description
Geomagnetic observatories that were putting hourly values in machine-readableform prior to the International Geophysical Year.
Display Date
1969
Collection
Historic Coast & Geodetic Survey
Keywords
Coast and Geodetic Survey
Geophysics Geomagnetism