Ashley, Ruth. <br/><br/>
Tape and disk files :  Cobol book 3 / 
Ruth Ashley, Judi Fernandez. 
 - New York :  Wiley,  c1984. 
 - x, 267 p. :  ill. ;  29 cm. 
 - Data processing training series .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0471871842 (soft) :  $49.95 (est.) 
<br/><br/><label>LCCN: </label>84011943  
<br/><br/><label>Subjects--Topical Terms: </label><br/>File organization (Computer science)<br/>COBOL (Computer program language)<br/>Data tapes.<br/>Data disk drives.
<br/><br/><label>LC Class. No.: </label>QA76.9.F5  / A84 1984 
<br/><br/><label>Dewey Class. No.: </label>001.64  / AST 1984