"This study examines the main trends of various models of international migration for the nineteenth and early twentieth centuries, and places emphasis on the volume and direction of various models of migration at present. Permanent migration, illegal migration in search of work and compulsory migration (refugees) are discussed in some detail with reference to the occasional difficulty of distinguishing between the various types of migration. When discussing the volume and sources of migration, the study indicates some of its motives and implications at origin and at destination and presents some of the future prospects and major factors that contribute to the continuation of the flow of the different types of migration." The geographical scope is worldwide.
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