 |
| retrieval systems: 36 phrases in 14 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Communications | 1 |
| Data processing | 1 |
| Forestry | 2 |
| General | 2 |
| Information technology | 8 |
| Law | 3 |
| Materials science | 1 |
| Medical appliances | 6 |
| Natural sciences | 1 |
| Social science | 1 |
| Transport | 1 |
| Work flow | 7 |