 |
| toxic chemical: 50 phrases in 14 subjects |
| Astronautics | 8 |
| Chemistry | 1 |
| Ecology | 3 |
| Energy industry | 1 |
| Industry | 1 |
| Makarov | 1 |
| Material safety data sheet | 1 |
| Military | 18 |
| Nanotechnology | 4 |
| Production | 1 |
| Technology | 3 |
| Toxicology | 2 |
| United Nations | 2 |
| Weapons of mass destruction | 4 |