News Wires, White Papers, and Books
- Reaction Control Systems
- Reaction Rates
- Reclamation and Reuse
- Record-Holding Plants
- Reisner, Marc
- Religions, Water in
- Remote Sensing Systems
- Remotely Sensing the Heat Island Effect
- Reproduction in Plants
- Reproduction, Alternation of Generations and
- Reproduction, Asexual and Sexual
- Reproduction, Fertilization and
- Reservoirs, Multipurpose
- Resource Utilization
- Rhythms in Plant Life
- Rhythms of Plant Life
- Rights, Public Water
- River Basin Planning
- Rivers and Streams
- Rivers, Major World