Jackson Willams. From Constantinople to the Home of Omar Khayyam

New York: The Macmillan Company, 1911. — 526 p.Travels in Transcaucasia and norther Persia for historic and literature research. Omar Khayyám (born Ghiyāth ad-Dīn Abu'l-Fatḥ ʿUmar ibn Ibrāhīm al-Khayyām Nīshāpūrī ,Persian: غیاث‌الدین ابوالفتح عمر ابراهیم خیام نیشابورﻯ, pronounced 18 May 1048 – 4 December 1131), was a Persian mathematician, astronomer, philosopher, and poet, who is widely considered to be one of the most influential scientists of the middle ages. He wrote numerous treatises on mechanics, geography, mineralogy and astronomy. With over two hundred illustrations and maps.