[Sanitation in Petersburg; 250th anniversary of the foundation of the city].
D000846:Anniversaries and Special Events; D002947:Cities; D006801:Humans; D008913:Minority Groups; D011634:Public Health / Q000266:history*; D044469:Racial Groups; D012499:Sanitation
PUBLIC HEALTH/history
Sanitarnoe delo v Peterburge; k prazdnovaniiu 250-letiia osnovaniia goroda.