Descriptor
| Age Differences | 1 |
| Exceptional Child Research | 1 |
| Intelligence Differences | 1 |
| Mental Retardation | 1 |
| Mild Mental Retardation | 1 |
| Moderate Mental Retardation | 1 |
| Speech Communication | 1 |
| Vocabulary | 1 |
| Word Frequency | 1 |
Source
| Amer J Ment Deficiency | 1 |
Author
| Beier, Ernst G. | 1 |
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Beier, Ernst G. – Amer J Ment Deficiency, 1969
Descriptors: Age Differences, Exceptional Child Research, Intelligence Differences, Mental Retardation
