TY JOUR TI CONTRIBUTION TO THE ORGANIZATION OF THE EPIDEMIOLOGICAL SAFETY SYSTEM FOR THE POPULATION IN BESIEGED LENINGRAD BY F.I. MASHANSKY KW siege of Leningrad KW Leningrad City Health Department KW anti-epidemic commissions KW quarantine KW epidemics JO Psychological and pedagogical problems of human and social security AU Bolotin, D.D. AU Smirnova, A.A. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia