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Are you Erich Übelacker, author of the books below?
Planeten und Raumfahrt by Erich Übelacker Der Mond by Erich Übelacker Moderne Physik by Erich Übelacker Unser Kosmos - an den Grenzen von Raum und Zeit by Erich Übelacker Sternbilder und Sternzeichen by Erich Übelacker Modern Fizika # 15 by Erich Übelacker Energie by Erich Übelacker Die Sonne by Erich Übelacker Die Zeit by Erich Übelacker The Universe by Erich Übelacker


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