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| sustainable land use (sustainable use of land resources Tverskaya); land-use management (Ivan Pisarev) | |||
| рациональное использование земельных ресурсов: 5 phrases in 4 subjects |
| Astronautics | 1 |
| Ecology | 2 |
| Name of organization | 1 |
| Natural resourses and wildlife conservation | 1 |