15. IUCN presented a copy of a draft directory of natural World Heritage sites inscribed to the end of 1988 prepared by the Protected Areas Data Unit (PADU) of the World Conservation Monitoring Centre (WCMC). This directory provided the most up-to-date data available for these sites. In June 1989, States Parties with sites inscribed before 1986 had been asked by IUCN to update the data sheets, but responses had to date been received from only 7 of the 28 countries concerned, covering 19 out of 63 sites. The Committee requested IUCN to follow-up with the States Parties whose responses were still awaited. The Committee suggested that a deadline of 1 March 1990 be fixed in order that PADU could make the information available to IUCN for the Bureau at its 14th session.