Proceedings of the International Symposium on Water Erosion 

 - IHP, MAB and UNESCO Varna, Bulgaria  1988 
 - p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrology.<br/>General.<br/>HYDRO.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Bulgaria.