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Ueber den Farben- und Temperatur-Sinn mit besonderer Rücksicht auf Farbenblindheit
William Thierry Preyer
The Mind of the Child, Part II; The Development of the Intellect, International Education Series Edited By William T. Harris, Volume IX.
William Thierry Preyer
Conscious Motherhood: Or, the Earliest Unfolding of the Child in the Cradle, Nursery, and Kindergarten, Part 1
William Thierry PreyerThe Mind of the Child: ... Observations Concerning the Mental Development of the Human Being in the First Years of Life; Volume 1
William Thierry Preyer