Leon, Alexis  . <br/><br/>
IBM mainframe: handbook /   Textual Documents 
Alexis Leon. 
 - New Delhi :   Vikas Publishing House ,   2003. 
 - NULL ;   NULL. 
<br/><br/><label>Subjects--Index Terms: </label>IBM mainframe IBM  
<br/><br/><label>Dewey Class. No.: </label>004.1257IBM  / LEO