Zur Erklärung der Farbenblindheit aur der Theorie der Gegenfarben / von Ewald Hering.
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Zur Erklärung der Farbenblindheit aur der Theorie der Gegenfarben / von Ewald Hering. Credit: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London). Public Domain Mark