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Weimar Bauhaus University: Digital Collectoins, 1906
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Weimar Bauhaus University: Digital Collectoins, 1896
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Weimar Bauhaus University: Digital Collectoins, 1894
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Springer Science and Business Media LLC, 2006
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Springer Science and Business Media LLC, 1926
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American Psychological Association (APA), 1906
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JSTOR, 1905
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The Science Press, 1905
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American Psychological Association (APA), 1896
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American Psychological Association (APA), 1906