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Message * Articles On Patterned Grounds, including Pingo, Palsa, Storflaket, Lithalsa, Permafrost, Giant's Causeway, Desiccation, Frost Heaving, Vertisol, Ice Wedge, Thermokarst, Ripple Marks, Fracture (geology), Patterned Ground - 1244737526 - 9781244737525