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riprap : 52 phrases in 14 subjects |
| Architecture | 1 |
| Cement | 1 |
| Construction | 3 |
| Electronics | 9 |
| Geology | 1 |
| Gold mining | 4 |
| Hydraulic engineering | 5 |
| Melioration | 2 |
| Military | 2 |
| Mining | 3 |
| Natural resourses and wildlife conservation | 2 |
| Road works | 3 |
| Technology | 15 |
| Transport | 1 |