A point scale for measuring mental ability / by Robert M. Yerkes, James W. Bridges and Rose S. Hardwick.
- Yerkes, Robert M. (Robert Mearns), 1876-1956.
- Date:
- 1915
Licence: Public Domain Mark
Credit: A point scale for measuring mental ability / by Robert M. Yerkes, James W. Bridges and Rose S. Hardwick. Source: Wellcome Collection.
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