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Jeffries, B. Joy (Benjamin Joy), 1833-1915 (2)
Tweedy, John, 1849-1924 (2)

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Relative frequency of color-blindness in males and females / by B. Joy Jeffries.
Jeffries, B. Joy (Benjamin Joy), 1833-1915.Date: 1878
Books
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Report of the examination of 27,927 school children for color-blindness / by B. Joy Jeffries.
Jeffries, B. Joy (Benjamin Joy), 1833-1915.Date: 1880
Books
Online
Colour-blindness.
Date: 1881