Barraclough, Geoffrey, 1908-1984. The crucible of Europe : the ninth and tenth centuries in European history / [manuscript] : Geoffrey Barraclough. - Berkeley : University of California Press, c1976. - 180 p. : ill. ; 25 cm. Includes index. Bibliography: p. 172-174. ISBN: 0520031059 (pbk) 0520031180 LCCN: 75021934 Subjects--Topical Terms: Middle Ages.Carolingians.Feudalism. Subjects--Geographic Terms: Holy Roman Empire. LC Class. No.: D123 / .B37 1976b Dewey Class. No.: 940.1/4