Marcos wrote: "Not merge, but combined. And combined you have them."
One of the editions has a truncated ISBN because it was put in the wrong field. Therefore they needed to be separated out from the main work and merged.
I have done this. It may take a day or so to appear correctly.
https://www.goodreads.com/book/show/6...
and
https://www.goodreads.com/book/show/6...
are the same, could you please merge them?