Verboorm, W. C. <br/><br/>
Crops and ecology. 

 - Lusaka :  Dept. of Agriculture, Land Use Services Division,  1970. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture -- Zambia.--Agriculture -- Zambia.<br/>Field crops -- Zambia.--Field crops -- Zambia.