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- Achievement tests -- South Africa 1
- Acid mine drainage 4
- Acid mine drainage -- Environmental aspects 1
- Acid mine drainage -- Purification 1
- Acid mine drainage -- South Africa 1
- Acidthiobacillus caldus 1
- Acinetobacter 1
- Acoustic sound wave 1
- Acoustics -- Sound-waves 1
- Acrylic resins 2
- AcSELerator Quickset 1
- AcSELerator RTAC 1
- Acti-zyme 1
- Actinobacteria 1
- Activated carbon 1
- Activated sludge 1
- Activated sludge model No.1 (ASM1) 1
- Active learning 1
- active power 1
- Activity Theory 1