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Structure or a bridge? This is a reasonably common project and the ones I'm familiar with are usually to build a bridge, where the structure will be placed between two desks. If you get the geometry right, it can support more than the weight of a textbook. And ralliart is right. The design should consist of triangles.
If it is just a structure that you have to place the book on top of, a simple but strong structure starts with a triangular base and is built like a 3-sided pyramid, except you don't build it to a point. The sides and levels/floors consist of many small triangles 1-by-1-by-1 toothpicks long.
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