3G handy guide:  bar operations / 
3G E-Learning 
 - New York:  3G E-Learning,  c2019. 
 - x, 213p.:  col. ill. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>978-1-98462-447-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bars
<br/><br/><label>Dewey Class. No.: </label>647.95 T531b 2019