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The mind of the child. Observations concerning the mental development of the human being in the first years of life. Part 2. The development of the intellect / by W. Preyer ; transl. from the original German, by H.W. Brown. - New York : D. Appleton and Company, 1890. - XLI, [1], 317, [1] p. - (International education series / ed. by William T. Harris ; vol. 9).