Descriptor
| Age Differences | 1 |
| Classification | 1 |
| Cognitive Development | 1 |
| Cognitive Processes | 1 |
| Exceptional Child Research | 1 |
| Longitudinal Studies | 1 |
| Mental Retardation | 1 |
| Mild Mental Retardation | 1 |
| Symbolic Learning | 1 |
Source
| American Journal of Mental… | 1 |
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Peer reviewedStephens, Beth; McLaughlin, John A. – American Journal of Mental Deficiency, 1974
Descriptors: Age Differences, Classification, Cognitive Development, Cognitive Processes
