1. 
   CSO
   Campus Phone Book software developed for, and originally used at, the Computer Services Office of the University of Illinois at Urbana-Champaign. The server software is known as 'qi' and the client is 'ph'. Recent versions of the software refer to CCSO (Computing & Communications Service Office). ...
   Found op http://foldoc.org/CSO
   
   
2. 
   CSO
   acronym: Central Statistical Organization
   Found op http://cdiac.ornl.gov/pns/acronyms.html#C
   
   
3. 
   CSO
   Central Services Organization
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
4. 
   CSO
   Civil society organization
   Found op http://www-personal.umich.edu/~alandear/glossary/c.html
   
   
5. 
   cso
   1) Central statistical organization 2) Sir georg solti's gp.
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/cso/1
   
   

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