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Walter Kraul

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Astronomy For Young And Old: A Beginner's Guide To The Visible Sky
Earth, Water, Fire, and Air: Playful Explorations in the Four Elements
Erscheinungen am Sternenhimmel. Die Bewegungen der Gestirne beobachten und verstehen.
Earth, water, fire and air: playful explorations in the four elements.
Earth, Water, Fire, and Air Playful Explorations in the Four Elements