Nexus journal: series or not?

[Marcel]

In the Netherlands we have a journal called Nexus. Some (jubilee) editions are published as books, including an ISBN, like Europees humanisme in fragmenten: grammatica van een ongesproken taal. When you look at the entry of it in the Utrecht University Library, you'll notice it has an ISSN, too.

What should I do with this?
- Add "Nexus #50" to the edition field, like it is done here?
- Create a new series and add this book (along with another one) to it? In that case: is it possible to search for series, to see if it isn't already created by someone else?
- Do nothing?

Thank you in advance!

[rivka, Former Moderator]

It doesn't seem like a series. But adding the journal number to the edition field would be fine.