Descriptor
| Age Differences | 1 |
| Color | 1 |
| Discrimination Learning | 1 |
| Downs Syndrome | 1 |
| Drafting | 1 |
| Exceptional Child Research | 1 |
| Maturation | 1 |
| Mental Retardation | 1 |
| Readiness | 1 |
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Peer reviewedSinson, Janice C.; Wetherick, N. E. – Journal of Mental Deficiency Research, 1976
Descriptors: Age Differences, Color, Discrimination Learning, Downs Syndrome
