Subject
- Railroad stations1
- Railroads--Social aspects1
- Recreation1
- Recreation centers1
- Recycling (Waste, etc.)--Environmental aspects1
- Recycling (Waste, etc.)--Planning1
- Refuse and refuse disposal--Environmental aspects1
- Regional planning1
- Remote-sensing images1
- Reservoirs1
- Revolutions1
- Road maps1
- Rural development1
- Schools1
- Shrines1
- Silver mines and mining1
- Singapore--Bukit Timah Nature Reserve1
- Singapore--Central Catchment Nature Reserve1
- Singapore--Sungei Buloh Wetland Reserve1
- Social groups1