Population geography.
D000328:Adult; D000367:Age Factors; D000368:Aged; D003710:Demography; D004641:Emigration and Immigration; D005843:Geography; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics; D012942:Social Sciences
Adult; Age Factors; Aged; Demographic Factors; Geographic Factors; Geography; Human Geography; Migration; Population; Population Characteristics; Population Dynamics; Social Sciences; World