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3 97

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3 99

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402

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eighteen compounds and their correlation with P. . Thresholds. Ann. Eugen., 1951, 16, 119-128.

3. Blatz, W. E. The five sisters. N. Y.: Morrow, 1938.

4. Blatz, W. E., et al. Collected studies on the Dionne quintuplets. Univer.

Toronto Stud. Child Develpm., 1937.

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ment. Sci., 1954, 100, 922-933.

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adaptation of institution children. Lancet, 1950, 258, 173176.

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identical and fraternal twins. Char. And Person., 1934, 2, 293309.

9. Brodbeck, A. J., and Irwin, . The speech behavior of infants without

families. Child Develpm., 1946, 17, 145156.

10. Brody, D. Twin resemblances in mechanical ability, with reference to the

effects of practice on performance. Child Develpm., 1937, 8, 207-216.

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development; a comparative study of foster parent-foster child resemblance and true parent-true child resemblance. 2?h Yearb., Nat. Soc. Stud. Educ, 1928, Part I, 219-316.

12. Burks, Barbara S. A study of identical twins reared apart under differing

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