"Social sciences Emigration and immigration." . . "Emigration and immigration." . . "SOCIAL SCIENCE / Emigration & Immigration" . . . . . . "Electronic books"@en . "Migration and disruptions : toward a unifying theory of ancient and contemporary migrations"@en . . . . . "In this groundbreaking unifying theory of migration, a group of researchers from various anthropological disciplines attempt to identify the social and environmental disruptions that led to migration, regardless of its temporal space. Never before has such a diverse group of scholars met to identify and codify across time the reasons humans migrate."@en . . . . . "Human beings Migrations." . .