title: [Passport registers: their limits and possibilities for the study of emigration].
mesh_terms: D017677:Age Distribution; D000367:Age Factors; D000569:Americas; D003625:Data Collection; D003710:Demography; D019049:Developed Countries; D004467:Economics; D004641:Emigration and Immigration; D005060:Europe; D006280:Health Workforce; D019359:Knowledge; D008004:Licensure; D009656:North America; D009790:Occupations; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics; D011174:Portugal; D011996:Records; D012106:Research; D012107:Research Design; D017678:Sex Distribution; D012737:Sex Factors; D012744:Sex Ratio; D013223:Statistics as Topic; D014171:Transients and Migrants; D014481:United States
keywords: Age Distribution; Age Factors; Americas; Data Analysis; Data Collection; Data Quality; Data Sources; Demographic Factors; Developed Countries; Economic Factors; Europe; Historical Survey; Human Resources; Illegal Migrants; International Migration; Knowledge; Migrants; Migration; North America; Northern America; Occupations; Permits; Population; Population Characteristics; Population Dynamics; Portugal; Research Methodology; Sex Distribution; Sex Factors; Sex Ratio; Southern Europe; Travel Documents; United States
vernacular_title: Registros de pasaportes: sus limitaciones y sus posibilidades para el estudio de la emigracion.