Leppan, W. D. <br/><br/>
The agricultural development of arid and semi-arid regions with specialreference to South Africa. 

 - [Pretoria] :  Central Newo Agency,  1928. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arid regions agriculture.<br/>Agriculture -- South Africa.--Agriculture -- South Africa.