[D. D. Bekariukov, an outstanding scientist in the field of school hygiene].
D004396:Coloring Agents; D049672:History, 19th Century; D049673:History, 20th Century; D006920:Hygiene; D012574:Schools
D004396:Coloring Agents
BIOGRAPHY
D. D. Bekariukov- vydaiushchiisia deiatel' b oblasti shkolnoi gigieny.