| Code | Description | Items |
|---|---|---|
| 540 | Chemistry & allied sciences | 64 |
| 541 | Physical & theoretical chemistry | 7 |
| 542 | Techniques, equipment, materials | 6 |
| 543 | Analytical chemistry | 3 |
| 544 | Qualitative analysis | 1 |
| 545 | Quantitative analysis | 0 |
| 546 | Inorganic chemistry | 15 |
| 547 | Organic chemistry | 6 |
| 548 | Crystallography | 1 |
| 549 | Mineralogy | 39 |