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Twenty-One is a project funded within the EU Telematics Applications Pro gramme, sector Information Engineering. In Twenty-One non-profit environmental organisations, companies and research organisations work together to make docu ments on sustainable development and the environment more easily accessible. The most important deliverable of the project is the Twenty-One disclosure and retrieval system which produces an index on the multilingual multimedia document base. This index will bedblp:conf/riao/HiemstraJK97a fatcat:3akkvzeyszam3hj5l5w6zes3ta