[DEGREE OF CARBONIFICATION AS A CAUSE OF DIFFERENCE IN THE BIOLOGICAL AGRESSIVENESS OF BLACK COAL DUST?].
D002244:Carbon; D003031:Coal; D003032:Coal Mining; D003604:Czechoslovakia; D004391:Dust; D008903:Minerals; D011009:Pneumoconiosis
D003031:Coal; D004391:Dust; D008903:Minerals; D002244:Carbon
CARBON; COAL MINING; CZECHOSLOVAKIA; DUST; PNEUMOCONIOSIS
STUPE N PROUHELN EN'I JAKO P R'I CINA PUZN'E BIOLOGICK'E AGRESIVITY PRACHU Z  CERN'EHO UHL'I?