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MacDonald, Arthur. 1898. Chapter V: Psycho-physical and Anthropometrical Instruments of Precision in the Laboratory of the Bureau of Education. In: Experimental Study of Children, 1141-1204.
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ISSN 1866-4784: reference - xlink
Max Planck Institute for the History of Science, Berlin Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg Fakultät Medien, Bauhaus-Universität Weimar