3G handy guide :  air condition servicing / 
3G E-Learning 
 - New York :  3G E-learning LLC,  2019. 
 - vii, 212 p.: col. ill.; 23.3 cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>9781984625595 
<br/><br/><label>Dewey Class. No.: </label>C 697.93 T531 2019