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Several unofficial books have been written about Lego. The Unofficial LEGO Builder's Guide was written by Allan Bedford, targeted at children, with the aim of teaching a variety of building techniques at various scales (including minifigure scale and Legoland 'Miniland' scale), as well as including a small encyclopedia of some of the most common different types of Lego brick available.
There have also been many different books published about the Lego Mindstorms robotics product, some of which focus on its use as an educational toy within schools.