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.
7/42 (page 5)