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| Refuse and refuse disposal--Knowledge (2) |
| Refuse and refuse disposal--Management (2) |
| Iloilo (1) |
| Leon (1) |
| Solid waste management practices (1) |
| Refuse and refuse disposal--Knowledge (2) |
| Refuse and refuse disposal--Management (2) |
| Iloilo (1) |
| Leon (1) |
| Solid waste management practices (1) |