But you will still have problems, as Library Thing is throttling Calibre. So you have to do them one at a time, and after 2 - 4, take a break.
I finally just copied them from the Sony store (or Amazon or others) and imported them to Calibre.
Look up the book, click on it, click on View Larger under the cover, Right Click and Save. Edit Metadata Individually in Calibre, select Browse, select the proper cover and you are good to go.
More work, but the covers are the same size, and you can find a cover for pretty much everything.
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