Descriptor
| Heredity | 1 |
| Intelligence | 1 |
| Research | 1 |
| Sex Differences | 1 |
| Space Orientation | 1 |
| Twins | 1 |
| Visual Perception | 1 |
| Visualization | 1 |
Source
| Perceptual and Motor Skills | 1 |
Author
| Hartlage, Lawrence C. | 1 |
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Peer reviewedHartlage, Lawrence C. – Perceptual and Motor Skills, 1970
Descriptors: Heredity, Intelligence, Research, Sex Differences
