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- Association football -- South Africa 1
- Asteraceae -- Seeds 1
- Astronautics -- Systems engineering. 1
- Astronomical instruments 1
- Astronomical observatories -- South Africa -- Northern Cape 1
- Astronomical observatories -- South Africa -- Northern Cape -- Economic aspects 1
- At-risk students 1
- Atherosclerosis 1
- Athletic ability 1
- Atmospheric carbon dioxide 1
- Atomic absorption spectroscopy 1
- Atoms 1
- Attention-deficit disordered children -- Education 1
- Attention-deficit hyperactivity disorder 1
- Attention-deficit-disordered children 1
- Attitude and Practice survey 1
- Audio amplifiers 1
- Audio-visual equipment -- Energy consumption 1
- Audiometry 1
- Auditing 1