U.S.C.G.S. Geomagnetic Data for 3 stations, 1947-1969
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下载链接：
https://cmr.earthdata.nasa.gov/search/concepts/C1214055089-SCIOPS.html
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资源简介：
Later data are at NCAR, on a CDROM from NGDC.
提供机构：
SCIOPS
