Topic
- Building materials 2
- Census 2
- Education 2
- Food 2
- Health 2
- Human settlements 2
- Industries 2
- Irrigation 2
- Labor 2
- Portland (Or.) 2
- Race relations 2
- Sewage 2
- Soils 2
- Urbanization 2
- Water-supply 2
- Zionism 2
- Al-Wehda Dam (Jordan) 1
- Ba'athism 1
- Baghdad (Iraq) 1
- Child welfare--Oregon 1