Christiansen, Eric H. Exploring the planets / Eric H. Christiansen, W. Kenneth Hamblin. - 2nd ed. - Englewood Cliffs, N.J. : Prentice Hall, c1995. - xi, 500 p. : ill. ; Includes index. ISBN: 0023224215 Subjects--Topical Terms: Planets LC Class. No.: QB603.G46 / H36 1995