[M. Tsetkin (on the 100th anniversary of his birth)].
D005859:Germany, East; D049672:History, 19th Century; D049673:History, 20th Century; D011635:Public Health Administration / Q000266:history*; D013222:State Medicine / Q000266:history*; D014586:USSR
M. Tsetkin (k 100-letiiu so dnia rozhdeniia).