[Sick and accident rate of mining apprentices in the course of their apprenticeship].
D000062:Accidents, Occupational; D000293:Adolescent; D003604:Czechoslovakia; D006801:Humans; D008297:Male; D008906:Mining; D009017:Morbidity
Nemocnost a úrazovost hornických ucnů v průbĕhu tri ucebních let.