The detection of colour-blindness and imperfect eyesight : with a table of coloured Berlin wools and sheet of test-types

Roberts, Charles, 1836-1901, University of Leeds. Library · 1884 · London : J. & A. Churchill · 3 pictures

Colour vision defects · Colour perception tests

Internet Archive · University of Leeds Library · Public domain (published before 1931) · More from this library