[Koha] Multiple URLs for digital Items

Dear List, Is it possible to specify several URLs for digitized version of a single book? In fact we have internal digitized versions which we specify using the URL field in the items mask of koha, however it only allows us to add one URL. What we would like to do is add several URLs with external digitized versions of the book. Is this possible at all? Regards, Wolfgang -------------------------------------- Information gemaess UGB Par. 14 Abs. 1 Naturhistorisches Museum 1010 Wien, Burgring 7 Firmenbuchnummer: FN 236724z Firmenbuchgericht: Handelsgericht Wien UID: ATU 38020609 --------------------------------------