Encyclopedia of geographic information sources:   International volume  

 - 4th ed.  
 - Michigan:   Gale Research Company,   1988 
 - 498p.  
<br/><br/><label>ISBN: </label>0-8103-0410-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social science
<br/><br/><label>Subjects--Index Terms: </label>Information sources  
<br/><br/><label>Universal Decimal Class. No.: </label>D 03(026):91  / L8;M8