Graves, Charles Parlin. A world explorer: Marco Polo / Ill. by Ray Keane. - [S.l.] : Garrard, 1963. - 96 p. : ill. LCCN: 63007876 Subjects--Personal Names: Polo, Marco, 1254-1323? Subjects--Topical Terms: Mongols--History. Dewey Class. No.: 921