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

Color blindness : remarks / by B. Joy Jeffries at the twenty-ninth annual meeting of the board of the supervising inspectors of steam vessels.

Report of the examination of 27,927 school children for color-blindness / by B. Joy Jeffries.

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

Color blindness : remarks / by B. Joy Jeffries at the twenty-ninth annual meeting of the board of the supervising inspectors of steam vessels.

Report of the examination of 27,927 school children for color-blindness / by B. Joy Jeffries.