9A SUPPORT SYSTEMS
| Blackboard Tools | 9A10.05 Pointers |
| 9A10.12 Protractors | |
| Visual Aids | 9A15 |
| Audio | 9A20.30 Cassette Player |
| 9A20.90 Speakers | |
| Slide Projectors | 9A30 |
| Film Projectors | 9A34 |
| Overhead Projectors | 9A36 |
| Video and Computer Displays | 9A38 |
| Photography | 9A40 |
| X-Y Chart Recorders | 9A50 |
| Buildings | 9A60 |
| Classrooms | 9A61 |
| Labs | 9A62 |
| Storerooms | 9A63 |
| Workshop | 9A64 |
| Museums | 9A65 |
| Resource Books | 9A70 |
| Unclassified Demonstrations | 9A73 |
| Philosophy | 9A75 |
| Film Reviews | 9A80 |
| Computer Program Reviews | 9A85 |