title: Trends in the relationship between  infant mortality and socioeconomic status: 1950 and 1970.
mesh_terms: D000569:Americas; D003710:Demography; D019049:Developed Countries; D007226:Infant Mortality; D009026:Mortality; D009656:North America; D011153:Population; D011157:Population Dynamics; D014481:United States
keywords: Americas; Child Mortality; Demographic Factors; Developed Countries; Differential Mortality; Infant Mortality; Mortality; North America; Northern America; Population; Population Dynamics; United States