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- Meetings 20
- African Americans 6
- Urban League of Portland (Portland, Or.) 6
- Hydrology 5
- Politics and government 5
- Economics 4
- Bibliography 3
- International Hydrological Programme 3
- Older people 2
- Water-supply 2
- Audiences 1
- Church buildings 1
- Conference rooms 1
- Dark, Lawrence J. 1
- Geographic information systems 1
- Groundwater 1
- Peace 1
- Sewage--Purification 1
- Technology 1
- Unesco 1