[Hygienic characteristics of the daily regime of students in the Tosnensk Region of the Leningrad Oblast].
D006801:Humans; D006920:Hygiene; D012426:Russia; D012572:School Health Services
K voprosu o gigienicheskoĭ kharakteristike rezhima dlia uchashchikhsia Tosnenskogo raĭona Leningradskoĭ Oblasti.