| 405 / | HD | HYDRAULIC AND EARTH ENGINEERING |
| 258 | DF | EARTH TREATMENT OR CONTROL {5} |
| 263 | DF | .~ Chemical {2} |
| 266 | ![]() | .~.~ Cementitious (e.g., grouting) {3} |
| 267 | DF | .~.~.~> Filling substerranean cavity (e.g., underground wall) |
| 268 | DF | .~.~.~> Lining |
| 269 | DF | .~.~.~> Injector |