[Nikolaĭ Vasil'evich Tsitsin (on his 80th birthday)].
D000383:Agriculture / Q000266:history; D005823:Genetics / Q000266:history; D049672:History, 19th Century; D049673:History, 20th Century; D012425:Russia (Pre-1917); D014586:USSR; D014730:Veterinary Medicine / Q000266:history
Nikolaĭ Vasil'evich Tsitsin (k 80-letiiu so dnia rozhdeniia).