On geography an Arabic edition and English translation of Epistle 4 - Sánchez Rojo, Ignacio Javier; Sánchez Rojo, Ignacio Javier; Montgomery, James E. 1962-; Montgomery, James E. 1962- (Oxford University Press, 2014)
Text in Arabic with an English translation
Keywords: Ikhwān al-Ṣafāʾ; Historical geography / Early works to 1800; Islamic cosmology / Early works to 1800; Philosophy, Arab / Early works to 1800; Islam; Kosmologie; Quelle