[On the 70th birthday of Professor Lev Il'ich Los'].
D049673:History, 20th Century; D006920:Hygiene / Q000266:history; D011634:Public Health / Q000266:history; D012499:Sanitation / Q000266:history; D014586:USSR
K 70-letiiu so dnia rozhdeniia professora L'va Il'ich Losia.