- Force of Gravity
Newton's universal law of gravity explained. http://www.onlineastronomy.com/astr161/lect/history/newtongrav.html (Added: Fri Feb 14 2003)
- Land and Marine Gravity Data
Data documenting the variations in Earth's gravity field worldwide. http://www.ngdc.noaa.gov/seg/potfld/gravity/welcome.shtml (Added: Fri Feb 14 2003)
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