Subject
- Boundaries41
- Environment33
- Society19
- Water conservation16
- Water quality management16
- Geoscientific Information14
- Transportation9
- Utilities and Communication9
- Inland Waters7
- Structure7
- Planning and Cadastral6
- Administrative and political divisions5
- Biology and Ecology5
- Cities and towns5
- Farming5
- Roads5
- Special districts5
- Drainage4
- Earthquakes4
- Environmental protection4