Calvino, Italo. Invisible cities / Italo Calvino ; translated from the Italian by William Weaver. - San Diego, Calif. : A Harvest Book, 1974. - 165 p. ISBN: 0156453800 Subjects--Topical Terms: Polo, Marco, 1254?-1323?--Fiction.Kublai Khan, 1216-1294--Fiction.