| Description | Photocopied articles "Determination of the Tristumulus Values of the Spectrum for Eight Egyptian Observers and One British Observer" in 'Journal of the Optical Society of America', vol. 42, number 11, (November 1952); and "The Photopic Luminosity Curve for a Group of Fifteen Egyptian Trichomats" in Journal of the Optical Society of America', vol. 42, number 8, (August 1952). |