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| Edition | Availability |
|---|---|
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1
Psychological studies on twins: 7 : Object sorting : Preliminary report
1969, University of Helsinki
in English
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2
Psychological studies on twins: 6 : Abstract and concrete thinking in some verbal tests : Preliminary report
1968, University of Helsinki
in English
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3
Psychological studies on twins: 5 : Perimetric thresholds: Environmental versus hereditary determination
1967, University of Helsinki
in English
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