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Walter Kraul

Walter Kraul taught maths and physics at the Rudolf Steiner School in Munich, Germany. He operates Spielzeug Kraul, a specialty toy company.

Books by Walter Kraul :

Astronomy for Young and Old

A Beginner's Guide to the Visible Sky

Earth, Water, Fire, and Air

Playful Explorations in the Four Elements (3rd Edition)
Translated by Donald Maclean