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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 50. A. Seiff et al., "Wind Speeds Measured in the Deep Jovian Atmosphere by the Galileo Probe Accelerometers," Nature 388: 650, 1997. 51. D.H. Atkinson, J.B. Pollack, and A. Seiff, "Galileo Doppler Measurements of the Deep Zonal Winds at Jupiter," Science 272: 842, 1996. 52. A. Seiff et al., "Structure of the Atmosphere of Jupiter: Galileo Probe Measurements," Science 272: 844, 1996. 53. K. Zhang and G. Schubert, "Penetrative Convection and Zonal Flow on Jupiter," Science 273: 941, 1996. 54. Space Studies Board, National Research Council, An Integrated Strategy for the Planetary Sciences: 1995–2010, National Academy Press, Washington, D.C., 1994, pp. 61, 80, 93. 55. C.B. Pilcher, S.T. Ridgway, and T.B. McCord, "Galilean Satellites: Identification of Water Frost," Science 178: 1087, 1972. 56. U. Fink, N.H. Dekkers, and H.P. Larson, "Infrared Spectra of the Galilean Satellites of Jupiter," Astrophysical Journal 179: L154, 1973. 57. G. Neukum et al., "Cratering Chronology in the Jovian System and Derivation of Absolute Ages," in Lunar and Planetary Science Conference XXIX, Abstract 1742, Lunar and Planetary Institute, Houston, Tex., 1998 (CD-ROM). 58. C.R. Chapman et al., "Cratering in the Jovian System: Intersatellite Comparisons," in Lunar and Planetary Science Conference XXIX, Abstract 1927, Lunar and Planetary Institute, Houston, Tex., 1998 (CD-ROM). 59. K. Zahnle, H. Levison, and L. Dones, "Cratering Rates on the Galilean Satellites," in Lunar and Planetary Science Conference XXIX , Abstract 1902, Lunar and Planetary Institute, Houston, Tex., 1998 (CD-ROM). 60. J.D. Anderson et al., "Europa's Differentiated Internal Structure: Inferences from Two Galileo Encounters," Science 276: 1236, 1996. 61. M.H. Cart et al., "Evidence for a Subsurface Ocean on Europa," Nature 391: 363, 1998. 62. C.F. Chyba, chair of the Europa Orbiter Science Definition Team, letter report to J. Bergstrahl, Code SR, NASA Headquarters, Washington, D.C., May 18, 1998.
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