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References
- ↑ USGS Geomagnetism Program FDSN
- ↑ Nelson, James H. (1962) Magnetism of the Earth C&GS Pub 40-1 p38
- ↑ Love, Jeffrey J. & Finn, Carol A. (2011) The USGS Geomagnetism Program and Its Role in Space Weather Monitoring AGU Space Weather Volume 9, Issue 7
