 |
| investigation: 189 phrases in 33 subjects |
| Agriculture | 4 |
| Chemistry | 1 |
| Commerce | 4 |
| Criminal law | 8 |
| Earth sciences | 1 |
| Economy | 7 |
| Electric traction | 1 |
| Electronics | 1 |
| Environment | 8 |
| Finances | 8 |
| General | 26 |
| Government, administration and public services | 2 |
| Health care | 4 |
| Human rights activism | 1 |
| Immigration and citizenship | 2 |
| Information technology | 1 |
| Insurance | 1 |
| Law | 41 |
| Life sciences | 3 |
| Medical | 8 |
| Metallurgy | 2 |
| Name of organization | 10 |
| Natural sciences | 4 |
| Nuclear and fusion power | 1 |
| Patents | 1 |
| Pharmacy and pharmacology | 3 |
| Politics | 3 |
| Security systems | 2 |
| Social science | 1 |
| Technology | 4 |
| Trade unions | 1 |
| Transport | 16 |
| United Nations | 9 |