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| Polytechnic University of Puerto Rico--Faculty--Research (1) |
| Polytechnic University of Puerto Rico--Graduate students--Research (1) |
| Trenchless construction (1) |
| Tunneling--Equipment and supplies (1) |
| Polytechnic University of Puerto Rico--Faculty--Research (1) |
| Polytechnic University of Puerto Rico--Graduate students--Research (1) |
| Trenchless construction (1) |
| Tunneling--Equipment and supplies (1) |