Wong, Teck Ong <br/><br/>
Acids and bases :  a teaching unit for the lower secondary school / 
by Wong Teck Ong 
 - Penang :  SEAMEO Regional Centre for Edu. in Science and Mathematics,  1974 
 - 175 p. :  ill. ;  28 cm. 
 - RCC-1 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Acids--Study and teaching<br/>Bases (chemistry)--study and teaching