Velasquez, Mary Ann A. <br/><br/>
General chemistry:  The essential concepts/ 
Velasquez, Mary Ann A. 
 - Manila:  Edric Publishing House,  2021. 
 - x, 127 p.: 
<br/><br/><label>ISBN: </label>978-621-8179-34-9 
<br/><br/><label>Dewey Class. No.: </label>M 540 V434 2021