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Origins of psychometry: Johan Jacob de Jaager, student of F. C. Donders on Reaction time and mental processes (1865). Translated and edited by Josef Brozek and Maarten S. Sibinga. With a complete facsim. of the original Dutch text; Jaager, Johan Jacob de; Nieuwkoop, B. de Graaf, 1970; Originally published as thesis, Utrecht, 1865, under title: De Physiologische tijd bij psychische processen;""Bibliography: p. 25-27 (1st group)"";""Bibliographical information laid in back of book""

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