SUBJECT
Terracing
Rice
5
Planting
4
Rice farming
3
Archaeology
2
History
2
Ifugaos (Philippine people)
2
Agriculture
1
Azolla
1
Commerce
1
Contingent valuation
1
Cyanobacteria
1
Deepwater rice
1
Description and travel
1
Earthworms
1
Environmental protection
1
Irrigation
1
Javanese (Indonesian people)
1
Nitrogen-fixing algae
1
Payments for ecosystem services
1
Planning
1
Politics and government
1
Research
1
Resilience (Ecology)
1
Resilience (Personality trait)
1
Rice planting rites
1
Social change
1
Social conditions
1
Social life and customs
1
Social structure
1