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2. Munsell, A. H.: Color sphere and mount. US Patent No. 640,792 of 9 Jan 1900
3. Munsell, A.: Notebooks 1900–1918. Accessible at www.cis.rit.edu/research/mcsl2/online/munselldiaries.php. Accessed 15 Jan 2014
4. Munsell, A.H.: Color and an Eye to Discern It. Self-Published, Boston (1907)
5. Munsell, A.H.: A Color Notation. Ellis, Boston (1905)