Vacca, Roberto <br/><br/>
La proxima Edad Media. 

 - Madrid  Editora Nacional  1973. 
 - 214 p. 
<br/><br/> Translation of: Ill medioevo prossimo venturo. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Civilization, Modern--1950-<br/>Technology and civilization