Timbuktu Manuscripts:Large collection of manuscripts about art; medicine; philosophy and science; as well as several copies of the Qur'an. The manuscripts range between the late 13th and the early 20th Centuries.'Calculation of numbers in the science of astronomy'; Timbuktu; 16th Century.From: Astronomical treatise from the Kitab hisab al-nimar wa huwa fi 'ilm al-nujum.