Lingual Cortical Defect of Unknown Etiology Lingual Cortical Defect of Unknown Etiologyv. 154No. 2420–421Mann, Robert W. 1990. "Lingual Cortical Defect of Unknown Etiology." American Journal of Reontgenology, 154, (2) 420–421.More...ID: 153301Type: articleKeywords: nh-anthropology; nmnh