Ng'weno, Hilary <br/><br/>
Let's find out about energy and machines 

 - Dar es Salaam  East African Literature Bureau  1969 
 - 47p.  23cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Force and energy
<br/><br/><label>LC Class. No.: </label>EAF PAM QC73.4.N48