Bos, E.S. <br/><br/>
Cartographic symbol design 

 - Irrigation department  Colombo 07  1984 
 - 85p.  fig.Table 
<br/><br/><label>Nat. Bib. No.: </label>6875 
<br/><br/><label>Subjects--Index Terms: </label>Symbol; Visual 
<br/><br/><label>Universal Decimal Class. No.: </label>528.923  / BOS