[CHANGES IN THE SANITARY STATUS OF THE POPULATION OF THE PEOPLE'S REPUBLIC OF BULGARIA].
D002031:Bulgaria; D006306:Health Surveys; D006801:Humans; D014798:Vital Statistics
BULGARIA; HEALTH SURVEYS; VITAL STATISTICS
IZMENENIIA V SANITARNOM SOSTOIANII NASELENIIA NARODNO I RESPUBLIKI BOLGARII.