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 |