Combining three series

These two are exactly the same:

https://www.librarything.com/nseries/297250/DuMont-Kunst-Reisefu%CC%88hrer
https://www.librarything.com/nseries/74129/DuMont-Kunst-Reisef%C3%BChrer

And this one is also the same, but labelled as a publisher series (actually, the series can be regarded as both, but it is very much an original series, with the guides specially written for this series):

https://www.librarything.com/nseries/17510/DuMont-Kunst-Reisef%C3%BChrer

In the past I have combined quite a few series, but I cannot find any indo on how to combine series in that new system.

Cheeers
Andreas

To combine series you use the "Edit Series" options on one of the series page, specifically "Relationships/Combine". That will bring up the series that overlap with the one you're on, and give you options to combine, or to set a series relationship (like one is a subseries of the other). You can see these relationships as they are now (overlapping, subseries, etc.) on the series page under "Related Series" or "Related Publisher Series".

You can't combine a publisher series with a regular series, so if your cases here are really the same thing and should be merged, you should change the definition of one or two of them from one series type to the other, in Edit Series/Basic Settings.

Thanks, I'll try that!

Also be aware that there is a bug in the system, that results in combined series seemingly self-uncombining for an unknown reason, details at: https://www.librarything.com/topic/340818
So if you return to the series later and find them uncombined, it might be due to this bug.