title: [Nikolaĭ Sergeevich Pravdin (on the centenary of his birth)].
mesh_terms: D049672:History, 19th Century; D049673:History, 20th Century; D012425:Russia (Pre-1917); D014116:Toxicology / Q000266:history; D014586:USSR
vernacular_title: Nikolaĭ Sergeevich Pravdin (k 100-letiiu so dnia rozhdeniia).