Researches on colour-blindness : with a supplement on the danger attending the present system of railway and marine coloured signals / by George Wilson.

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Researches on colour-blindness : with a supplement on the danger attending the present system of railway and marine coloured signals / by George Wilson. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.