[Hygienic characteristics of natural ultraviolet radiation in Leningrad].
D004781:Environmental Exposure; D006801:Humans; D011830:Radiation Effects; D011835:Radiation Protection; D011855:Radiodermatitis / Q000517:prevention & control*; D012426:Russia; D013472:Sunlight; D014466:Ultraviolet Rays
Gigienicheskaia kharakteristika estestvennoĭ ul'trafioletovoĭ radiatsii v Leningrade.