A Comparative Study of Identical and Non-Identical Twins with Respect to Intelligence Resemblances
by Gladys G. Tallman - 1928
The purpose of this study was two-fold: first, to compare the differences in intelligence quotient ratings of siblings, from one to four years apart in chronological age, with those of twins, and secondly, to study the differences in intellegence quotient ratings in twins appearing very much alike and those appearing very different.
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