[Marriage and fertility in various social groups].
D000328:Adult; D000367:Age Factors; D001723:Birth Rate; D005191:Family Characteristics; D006801:Humans; D008393:Marriage; D012424:Rural Population; D012426:Russia; D012923:Social Class; D012959:Socioeconomic Factors; D013334:Students; D014505:Urban Population
Brachnost' i plodovitost' u raznykh sotsial'nykh grupp.