Harwell, Edward M.,  1918- <br/><br/>
The check-out operation in self-service retail food stores / 
[by E.M. Harwell and Paul F. Shaffer]. 
 - Washington, D.C. :  U.S. Dept. of Agriculture, Production and Marketing Administration, Marketing and Facilities Branch,  1951. 
 - v, 72 p. :  ill. ;  26 cm. 
 - Agriculture information bulletin ;  no. 31 .
<br/><br/> Cover title. 
<br/><br/><label>LCCN: </label>agr51000243  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Supermarkets--Checkout counters.<br/>Self-service stores.
<br/><br/><label>LC Class. No.: </label>S21  / .A74 no. 31 
<br/><br/><label>National Agricultural Library Call No.: </label>1  / Ag84Ab no.31