Erik De Man, W.H.  <br/><br/>
Conceptual framework and guidelines for establishing geographic information systems (Preliminary version).  (Book) 

 - Paris  Unesco  1984 
 - 67p.  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography--Data processing
<br/><br/><label>Universal Decimal Class. No.: </label>659.2 ERI  / 582