title: Human migration:  theory, models, and empirical studies.
authors.forename: M J
authors.initials: MJ
authors.lastname: Greenwood
mesh_terms: D000569:Americas; D003710:Demography; D019049:Developed Countries; D003906:Developing Countries; D004641:Emigration and Immigration; D008722:Methods; D018803:Models, Economic; D008962:Models, Theoretical; D009656:North America; D011153:Population; D011157:Population Dynamics; D012106:Research; D012942:Social Sciences; D013997:Time Factors; D014481:United States
keywords: Americas; Demographic Factors; Demography; Developed Countries; Developing Countries; Economic Model; Literature Review; Methodological Studies; Migration, Internal--determinants; Migration--determinants; Models, Theoretical; North America; Northern America; Population; Population Dynamics; Population Theory; Research Methodology; Social Sciences; Theoretical Studies; Time Factors; United States