De gregori, Thomas R. <br/><br/>
Technology and the economic development of tropical African frontier 

 - London  Cleveland, World Publishing Company  1969 
 - viii,531p.  24cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Technological innovations
<br/><br/><label>LC Class. No.: </label>HC505.T4D4