| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 579 | DF | OXYGEN OR COMPOUND THEREOF {4} |
| 592 | DF | .~ Metal containing {12} |
| 593 | DF | .~.~ Plural metals or metal and ammonium {6} |
| 601 | DF | .~.~.~ Arsenic (e.g., arsenite, etc.) {1} |
| 602 | DF | .~.~.~.~ Arsenate {1} |
| 603 | | .~.~.~.~.~ And lead containing |