title: [Boris Tikhonovich Velichkovskiĭ (on his 50th birthday)].
mesh_terms: D049673:History, 20th Century; D009787:Occupational Medicine / Q000266:history; D012800:Siberia
vernacular_title: Boris Tikhonovich Velichkovskiĭ (k 50-letiiu so dnia rozhdeniia)