Person
Jeffries, B. Joy, 1853-
Catalogue
- Books
- Online
Dangers from color blindness in railroad employees and pilots / by B. Joy Jeffries.
Jeffries, B. Joy, 1853-Date: 1878
- Books
- Online
Color blindness : remarks / by B. Joy Jeffries at the twenty-ninth annual meeting of the board of the supervising inspectors of steam vessels.
Jeffries, B. Joy, 1853-Date: [1881]
- Books
- Online
Report of the examination of 27,927 school children for color-blindness / by B. Joy Jeffries.
Jeffries, B. Joy, 1853-Date: 1888