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Psychological Twin Research
註釋Part I. The extensive investigation: 1. Introduction. Problems -- 2. The twin populations -- 3. Variables and metods -- 4. The test scores of the twins -- 5. The school achievements of the twins -- 6. Standing height and weight of the twins -- 7. The "bandedness"--8. Intra-pair differences in handwriting -- Part II. The control investigation: 9. Problems and subjects -- 10. Methods and variables -- 11. The problem of similary diagnosis -- 12. Intra-pair relations.