Mortality of ageing people (males) by social groups in gainfully employed population in Bulgaria during 1965-1966.
D000368:Aged; D000383:Agriculture; D002031:Bulgaria; D006306:Health Surveys; D006801:Humans; D008297:Male; D009026:Mortality; D011634:Public Health; D012923:Social Class; D012924:Social Conditions; D014937:Work