African regional seminar on the application of appropriate technology in road construction :  Addis Ababa 10-20 March 1980. 

 - Geneva :  ILO,  1980. 
 - 45 p. ;  30 cm. 
<br/><br/> Open access. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Roads--Design and construction--Technological innovations--Congresses.