Barkworth, A. <br/><br/>
Proceedings of the 4th International Conference on Geoscience Information 

 - 1 - 411 
 - Afrika - Kartenwerk - Series W: Monograph to Sheet 12 .
<br/><br/><label>ISBN: </label>3-443-28315-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economic geography
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Africa, West--Economic conditions--1960-