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Quelle: Fotos: http://www.nps.gov/archive/yell/ Foto 1: Mud pot near Sulfur Cauldron; Mud Volcano area; Harlan Kredit; 1974 Foto 2: Mud pot; Mud Volcano area; Harlan Kredit; 1974 Foto 3: Mud pot; Mud Volcano area; Harlan Kredit; 1974 Foto 4: Mud pot; Mud Volcano area; RG Johnsson; 1963 |