- Hill farming--Thailand, Northern (1)
- Human ecology--Tropics--Congresses (1)
- Land use, Rural--Thailand, Northern (1)
- Mangrove swamps--Congresses (1)
- Rain forest ecology--Congresses (1)
- Rural development--Thailand, Northern (1)
- Shifting cultivation--Thailand, Northern (1)
- Tropics--Economic conditions--Congresses (1)
- Tropics--Social conditions--Congresses (1)