Model survey of Computer services. 

 - New York  United Nations          1991 
 - iv,36p.  cm. 
 -  Vol. 1 .
<br/><br/> Statistics papers series M, no. 81 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>V1N45,93:3.N92, N2/UN