The Persian Literature, Comprising The Shah Nameh, The Rubaiyat, The Divan, and The Gulistan, Volume 1 by Atkinson, James Bicknell, Herman FitzGerald, Edward Hafiz, 14th cent. Firdawsi Omar Khayyam Gottheil, Richard J. H. (Richard James Horatio)
 is a Project Gutenberg book, now on Github.