v: . 
Informationssysteme: ~,~ C 126.009 Karton 
Landwirtschaft 

D u boi s, Gerard: International Information 
Systems in the field of agriculture: AGRIS 
and CARIS.-Geneva: International Symposium 
on Documentation uf the United Nations and 
other ontergovernmental Organizations 1972. 
5 S. 4