Ninth International congress of psychology : held at Yale University, New Haven, Connecticut, September 1st to 7th, 1929, under the presidency of James McKeen Cattell proceedings and papers.

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International Congress of Psychology (9th : 1929 : New Haven, Conn.)

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Ninth International congress of psychology : held at Yale University, New Haven, Connecticut, September 1st to 7th, 1929, under the presidency of James McKeen Cattell proceedings and papers.