000 00246 a2200097 4500
082 _a662.62
_bUn3i
245 1 _aINTERNATIONAL CLASSIFICATION OF HARD COALS BY TYPE
260 _aGeneva
_bUnited Nations
_c1956
964 _gCIRC
997 _a19142 s C
999 _c452137
_d452137