Following this link, you will find the definition of mapping from a MARC 21 Bibliographic Record to a PLMET record – unfortunately, at this moment only in Polish. The mapping has been defined by Leszek Śnieżko from the NUKAT Center (NUKAT is the union catalog of Polish research libraries).

We would like to encourage libraries using MARC 21 internally (together with other interested entities) to consult the mapping proposal.