[Nikolai Davidovich Ball (on the 100th anniversary of his birth)].
D049672:History, 19th Century; D049673:History, 20th Century; D010341:Pathology, Veterinary / Q000266:history; D012425:Russia (Pre-1917); D014586:USSR
Ball Nikolai Davidovich (k 100-letiiu so dnia rozhdeniia.