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- Author(s):
- Jeffries, B. Joy (Benjamin Joy), 1833-1915
- Publication:
- Boston : Rand, Avery, & Co., Printers in the Commonwealth, 1878
- Subject(s):
- Color Vision Defects
Accidents, Occupational -- prevention & control
Pilots
Railroads
Massachusetts
- Author(s):
- Jeffries, B. Joy (Benjamin Joy), 1833-1915
- Publication:
- [Boston? : s.n., 1878?]
- Subject(s):
- Color Vision Defects -- congenital
- Author(s):
- Jeffries, B. Joy (Benjamin Joy), 1833-1915
- Publication:
- [Boston? : s.n., 1878?]
- Subject(s):
- Color Vision Defects
