Andresen describes several different versions of MARC that have largely been wrapped togeter in the community’s mind, reminding use that “although MARC21 is often
described as an international standard, it is only used in a limited number of countries.”1 In actuality, what we often refer to simply as MARC could be MARC21, UKMARC, UNIMARC or even danMARC2.2 This lack of a unified standard
has long been an issue with this particular format.