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| Assunto |
|---|
| Wages [3] |
| Waldron, Jeremy [1] |
| Wallace, Alfred Russel, 1823-1913 [1] |
| Walsh, Rodolfo (1927-1977) [1] |
| Walsh, Rodolfo, 1927-1977 [3] |
| Walzer, Michael [1] |
| War [9] |
| War of independence [4] |
| Waste management [6] |
| Waste recycling [8] |
| Waste treatment [6] |
| Waste waters [1] |
| Wastes [2] |
| Water [3] |
| Water pollution [9] |
| Water requeriments [3] |
| Water resources [3] |
| Water supply [4] |
| Water supply services [2] |
| Water treatment plants [1] |