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I also highly recommend this book. It uses post-apocalyptic scenario as a lens to examine fundamental society processes, and essential knowledge needed to reconstruct those processes in some crude form. Each chapter deals with different technology ( filtering water, growing crops, preserving food, making fabrics and clothes, forging metal tools, blowing glass). Explanations are wonderfuly clear and to the point, with some insightful comments about current and past state of technology. Great material for filling knowledge gaps.

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