Magnetic instrumentation. The Coast and Geodetic Survey was the Nation's primary geophysical agency until the early 1970's when its geomagnetic duties were transferred to the USGS.
Image ID: cgs02190, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1957 ca. Category: Coast and Geodetic Survey/Geophysics Geomagnetism/ • High Resolution Photo Available
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