Title: Gravity model comparison using GEOS I long-arc orbital solutions /
Authors: Lerch, F. J.; Marsh, James G.; O'Neill, Brian.; United States.; Goddard Space Flight Center.
Publisher: National Aeronautics and Space Administration ; For sale by the Clearinghouse for Federal and Scientific and Technical Information,
Year: 1969
Subjects: Geodetic satellites.; Gravitational fields Mathematical models.; Artificial satellites Orbits