1.: A history of exploration and geographical science from the conversion of the Roman empire to A. D. 900 : with an account of the Christian, Arab, and Chinese travellers and students / by Raymond Beazley 2.: A history of exploration and geographical science from the close of the ninth to the middle of the thirteenth century : (c. A. D. 900-1260) : with reproductions of the principal maps of the time / by Raymond Beazley |