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Model code of safety regulations for underground work in coal mines for the guidance of governments and of the coalmining industry
(1950)
The Coal Mines Regulation Act
(1949)
Gefahrenbekämpfung im Bergbau
Matuszewski, Jerzy, (1975)
Sources and methods : labour statistics / Volume 9, Transition countries = Pays en transition = Paises en transición
Current international recommendations on labour statistics
Sources and methods / International Labour Office, Geneva : labour statistics / Volume 10, Estimates and projections of the economically active population = Evaluations et projections de la population active = Evaluaciones y proyecciones de la población económicamente activa