On colour-sight and colour-blindness : in its relation to railway and sea signals : read before the Glasgow Philosophical Society, on March 5, 1879 / by J.R. Wolfe.

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On colour-sight and colour-blindness : in its relation to railway and sea signals : read before the Glasgow Philosophical Society, on March 5, 1879 / by J.R. Wolfe. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.