[Foremost Soviet hygienist; 90th anniversary of birth of G. V. Khlopin].
D000846:Anniversaries and Special Events; D003756:Dental Hygienists; D049672:History, 19th Century; D049673:History, 20th Century; D036801:Parturition
BIOGRAPHIES
Vydaiushchiisia sovetskii gigienist; k 90-letiiu so dnia rozhdeniia G.V. Khlopina.