Inside Out Library · Explore
Stillings pseudo-isochromatische Tafeln zur Prüfung des Farbensinnes
Stilling, J. (Jakob), 1842-1915 author · 1922 · Leipzig : Georg Thieme · 6 pictures
Color Vision Defects -- diagnosis · Vision Tests
Internet Archive · U.S. National Library of Medicine · Public domain (published before 1931) · More from this library