Relative frequency of color-blindness in males and females / by B. Joy Jeffries.

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

Colour-blindness.

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Color Vision Defects, epidemiology

Works from the collections

Relative frequency of color-blindness in males and females / by B. Joy Jeffries.

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

Colour-blindness.