The great medieval civilizations. P. 2-3 / by Gaston Wiet [et al.] ; with contributions by Jean Devisse, Betty Meggers and Roger Green. - Wiet, Gaston (1887-1971); Devisse, Jean (1923-1996); Meggers, Betty Jane (1921-2012); Green, Roger P. H. (1943- ). (History of Mankind Cultural and Scientific Development, 1975)