The Nuttall Encyclopedia
Fertile spots in a desert due to the presence of springs or water near at hand underground; met with in the deserts of North Africa, Arabia, and Gobi.
Wood, James, ed. Entry for 'Oases'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/o/oases.html. Frederick Warne & Co Ltd. London. 1900.