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Res., 106, 23349-23357, 2001." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "TYLER&HOWARD1973" REFERENCE_DESC = " Tyler, G.L. and Howard, H.T., Dual-frequency bistatic-radar investigations of the Moon with Apollos 14 and 15, J. Geophys. Res., 78, 4852-4874, 1973." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "TYLERETAL1983" REFERENCE_DESC = " Tyler, G. L., Marouf, E.A., Simpson, R.A., Zebker, H.A. and Eshleman, V.R., The microwave opacity of Saturn's rings at wavelengths of 3.6 and 13 cm from Voyager 1 radio occultation, Icarus, 54, 160-188, 1983." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = " TYLER1987" REFERENCE_DESC = " Tyler, G.L., Radio propagation experiments in the outer solar system with Voyager, Proceedings of the IEEE, 75, 1404-1431, 1987. " END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "TYLERETAL1992A" REFERENCE_DESC = "Tyler, G.L., G. Balmino, D.P. Hinson, W.L. Sjogren, D.E. Smith, R. Woo, S.W. Asmar, M.J. Connally, C.L. Hamilton, and R.A. Simpson, Radio Science Investigations with Mars Observer, J. Geophys. Res., 97, 7759-7779, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = " TYLERETAL1992B" REFERENCE_DESC = " Tyler, G.L., Simpson, R.A., Maurer, M.J. and Holmann, E., Scattering properties of the Venusian surface: Preliminary results from Magellan, J. Geophys. Res., 97, 13115-13140, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "TYLERETAL2001" REFERENCE_DESC = "Tyler, G.L., G. Balmino, D.P. Hinson, W.L. Sjogren, D.E. Smith, R.A. Simpson, S.W. Asmar, P. Priest, and J.D. Twicken, Radio science observations with Mars Global Surveyor: Orbit insertion through one Mars year in mapping orbit, J. Geophys. Res., 106, 23327-23348, 2001." 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