Descriptor
| Behavior Problems | 1 |
| Comparative Analysis | 1 |
| Downs Syndrome | 1 |
| Etiology | 1 |
| Exceptional Child Research | 1 |
| Institutionalized Persons | 1 |
| Intelligence Differences | 1 |
| Mental Retardation | 1 |
| Physical Characteristics | 1 |
Source
| Amer J Ment Deficiency | 1 |
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Johnson, Ronald C.; Abelson, Robert B. – Amer J Ment Deficiency, 1969
Descriptors: Behavior Problems, Comparative Analysis, Downs Syndrome, Etiology
