please combine duplicates

[Tiffany]

This https://www.goodreads.com/book/show/5... is a duplicate of https://www.goodreads.com/book/show/5...

And this https://www.goodreads.com/book/show/5... is a duplicate of https://www.goodreads.com/book/show/5...

[Renske]

Combining books doesn't require a superlibrarian, so the 'book issues' folder of this group is the right place.

(Although for the first book there was a duplicate that needed merging)