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The factors that influence the sensitivity of the retina to color : a quantitative study and methods of standardizing (1913)
Rand, Gertrude, 1886-1970 · Princeton, N.J. ; Lancaster, Pa. : Psychological review company · leaf 109
FiGl'KE I FlGUKK II P^IGIRK 111Color vision
Internet Archive · West Virginia University Libraries · Public domain (published before 1931). Free to use for anything.
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