Palmer, Roger C. <br/><br/>
The bar code book :  reading, printing, specification, and application of bar code and other machine readable symbols / 
by Roger C. Palmer. 
 - 3rd ed. 
 - Peterborough, N.H. :  Helmers Publishing, Inc.,  1995. 
 - ix, 386 p. :  ill. 
<br/><br/> Includes index. 
<br/><br/>Data entry techniques--History of Bar code--Symbologies. 
<br/><br/><label>ISBN: </label>0911261095 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bar coding.