Duncan, Ray,  1952- <br/><br/>
MS-DOS extensions / 
Ray Duncan. 
 - Redmond, WA :  Microsoft Press,  c1989. 
 - 100 p. 
 - Programmer's quick reference series .
<br/><br/><label>ISBN: </label>1556152124 :  $6.95 
<br/><br/><label>LCCN: </label>90074131     
<br/><br/><label>Subjects--Topical Terms: </label><br/>MS-DOS (Computer operating system)