Mwangi, G (et al) <br/><br/>
Mentor Science and Technology/  Learner's book Grade 4/ 
 cover title 
Printed by Modern Lithographic (K) Ltd. 
 - 1st. ed. 
 - Nairobi :  Mentor Publishing Company Ltd.,  2019. 
 - ii, 182p. : 
<br/><br/><label>ISBN: </label>9789966012715 
<br/><br/><label>Dewey Class. No.: </label>600.600