this is gravity course of berekely univ , its very easy to study
http://appliedgeophysics.berkeley.edu:7057/gravity/grav21.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav22.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav23.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav24.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav25.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav26.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav21.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav22.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav23.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav24.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav25.pdf
http://appliedgeophysics.berkeley.edu:7057/gravity/grav26.pdf
and other book in geodesy
http://samizdat.mines.edu/geodesy/geodesy.pdf
thanks
