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Continue to ChatDirt: The Erosion of Civilizations by David Montgomery https://amateurearthling.org/2010/05/12/dirt-the-erosion-of-civilizations-by-david-montgomery/
Dirt: The Erosion of Civilizations by David Montgomery https://amateurearthling.org/2010/05/12/dirt-the-erosion-of-civilizations-by-david-montgomery/