[THE HAZARD OF ACCIDENTS IN COAL MINES].
D000059:Accidents; D000062:Accidents, Occupational; D003031:Coal; D003032:Coal Mining; D006801:Humans; D011044:Poland
D003031:Coal
ACCIDENTS, INDUSTRIAL; COAL MINING; POLAND
ZAGROZENIA WYPADKOWE W G'ORNICTWIE W EGLOWYM.