1968. Paperback in Very Good condition. National Bureau of Standards Monograph 104. Contents include: Definition of Color; Tridimensionality of Color; Metamerism and Macular Pigmentation; Grassman's Law; The 1931 CIE Standard Colorimetric System and 1964 Supplement; Colorimetry by Difference; Color Specification by Material Standards; Pigmented or Dyed Surfaces; One-Dimensional Color Scales; Limitations of the Methods.