Barraclough, Geoffrey,  1908- <br/><br/>
The crucible of Europe :  the ninth and tenth centuries in European history / 
Geoffrey Barraclough 
 - London :  Thames and Hudson,  1976 
 - 180 p. :  ill. ;  25 cm. 
<br/><br/> Includes index 
<br/><br/>Bibliography : p. 172-174 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Middle Ages--History<br/>Carolingians<br/>Feudalism
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Holy Roman Empire