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by Jean Heidmann
by Jean Heidmann , Translated by Maureen Schaerffer , Ann Boesgaard , Foreword by Carl Sagan
by Heidmann, Jean; Kippenhahn, R.; Dorsel, A.
by Heidmann, Jean; Klein, Michael J.
by Jean Heidmann , Translated by Storm Dunlop
by Heidmann, Ute; Adam, Jean-michel