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2. Plan for ‘World Patent Index’;BIRPI and IIB,1966
3. Letter from Arpad Bogsch, Deputy Director of BIRPI, to Monty Hyams 29 October 1969,1969
4. Copy of draft contract between BIRPI and Derwent concerning world patents documentation service;Derwent Publications Ltd and BIRPI,1970
5. Draft of agreement between Derwent and WIPO/BIRPI;Derwent Publications Ltd and BIRPI/WIPO,1971