Resumen: Nineteenth- and early-twentieth-century industrialization provoked quantitative and qualitative changes in traditional European migratory patterns. Most of the economic and social history literature concerning the study of European internal migration during the industrializing period has emphasized permanent migration. This article shows, however, that temporary internal migration was common not only in preindustrial societies but in industrializing ones too. The article also examines the causes and the consequences of the persistence of temporary internal migrations in Spain from the mid-nineteenth century to the period leading up to the outbreak of the Spanish civil war (1936–39). Aggregate data sources are used in depth for this purpose. The information derived from aggregate sources is supplemented by reference to secondary sources, mainly comprising local and regional studies. Idioma: Inglés DOI: 10.1017/S0145553200013857 Año: 2007 Publicado en: SOCIAL SCIENCE HISTORY 31, 4 (2007), 539-574 ISSN: 0145-5532 Factor impacto JCR: 0.317 (2007) Categ. JCR: HISTORY rank: 10 / 16 = 0.625 (2007) - Q3 - T2 Categ. JCR: HISTORY OF SOCIAL SCIENCES rank: 12 / 17 = 0.706 (2007) - Q3 - T3 Tipo y forma: Artículo (PostPrint) Área (Departamento): Área Hª e Instituc.Económ. (Dpto. Estruc.Hª Econ.y Eco.Pb.)