[N.A. Semashko at the 1st congress of school health officers of Nizhegorod district in May 1919].
D049673:History, 20th Century; D012426:Russia; D012572:School Health Services / Q000266:history*
N.A. Semashko na I sëzde shkol'no-sanitarnykh vracheĭ Nizhegorodskoĭ gubernii v mae 1919 g.