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Subject
- Audio-visual aids247
- Visual education120
- Study and teaching115
- Visual perception111
- Audio-visual education105
- Catalogs104
- Audio-visual materials98
- Flow visualization98
- Bibliography57
- Blind49
- People with visual disabilities44
- Education41
- United States38
- History36
- Wind tunnels35
- Vision34
- Visual acuity33
- Motion pictures in education29
- Services for26
- Visual discrimination26