[NATURAL RADIOACTIVITY IN CZECHOSLOVAKIAN COAL AND METAL ORE MINES].
D003031:Coal; D003032:Coal Mining; D003604:Czechoslovakia; D008670:Metals; D008906:Mining; D011851:Radioactivity
D003031:Coal; D008670:Metals
COAL MINING; CZECHOSLOVAKIA; MINING; RADIOACTIVITY
P RIROZEN'A RADIOAKTIVITA V CS. UHELN'YCH A RUDN'YCH DOLECH.