Clarke, John Digby. <br/><br/>
Rural science for secondary schools :  a handbook for teachers in the tropics / 
[by] J.D. Clarke and G.N. Herington. 
 - [London] :  Longmans,  [1961 reprint] 
<br/><br/>Bibliography: p. 167-171. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching.<br/>Agriculture -- Tropics.--Agriculture -- Tropics.