Dangers from color-blindness in railroad employés and pilots / by B. Joy Jeffries.

  • Jeffries, B. Joy (Benjamin Joy), 1833-1915.
Date:
1878

Licence: Public Domain Mark

Credit: Dangers from color-blindness in railroad employés and pilots / by B. Joy Jeffries. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    9/42 (page 7)