Post prints of the 1st OVN conference at the Leiden University. In Dutch, with one English contribution by prof.dr. Andrew Prescot. Price € 10,- (€ 7,50 for OVN donors) plus postage (€ 3,50 the Netherlands; € 8,50 Europe; € 11,50 outside Europe).
Post prints of the 1st international OVN conference in the National Library in The Hague.