Reprint (1st work). Originally published: Erinnerungen an die Zukunft. Düsseldorf : Econ-Verlag, 1968. Reprint (2nd work). Originally published: Zurück zu den Sternen. Düsseldorf : Econ-Verlag, 1968. Reprint (3rd work). Originally published: Reise nach Kiribati. Düsseldorf : Econ-Verlag, 1981. Bibliography: p. 617-620.
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