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English
Cover-title · Vita · "Reprinted from Child development, vol. I, no. 4, December, 1930." · Thesis (PH. D.)--Johns Hopkins University, 1926 · "References": p. 288-291 · Microfilm · Master negative: 97-84087-25 · No. 25 on a reel of 30 titles · Filmed;
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