| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 579 | DF | OXYGEN OR COMPOUND THEREOF {4} |
| 592 | DF | .~ Metal containing {12} |
| 618 | DF | .~.~ Group IVA metal (Ge, Sn, or Pb) {1} |
| 619 | DF | .~.~.~ Lead {1} |
| 620 | | .~.~.~.~ Utilizing metallic lead as reactant {1} |
| 621 | DF | .~.~.~.~.~> Molten |