- Processor Architectures 25
- Circuits and Systems 22
- Ecology 17
- Environmental Management 13
- Computer Hardware 12
- Algorithm Analysis and Problem Complexity 10
- Computer Communication Networks 10
- Freshwater & Marine Ecology 9
- Coastal Sciences 8
- Hydrogeology 8
- Landscape Ecology 8
- Programming Techniques 8
- Nature Conservation 6
- Atmospheric Protection/Air Quality Control/Air Pollution 5
- Computation by Abstract Devices 5
- Forestry Management 5
- Operating Systems 5
- Software Engineering/Programming and Operating Systems 5
- Theory of Computation 5
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 5