Technical memorandum:   (TM series) 
/ System Development Corporation 
 - Colorado:   System Development Corporation,   1963 
 - TM   904 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information technology
<br/><br/><label>Universal Decimal Class. No.: </label>D 681.3.025.135   / L3