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- 地球重力场研究有关网站
- http://icgem.gfz-potsdam.de/ICGEM/ICGEM.html International Centre for Global Earth Models (ICGEM) http://www.ecoearth.info/ EcoEarth.Info http://www.usgs.gov/ ftp://ftp.nga.mil/pub2/gps/
