Well, I spooked myself.
Login to LibraryThing: apparently a member since 2016 with one book:
Typus Cosmographicus Universalis
It says I added it. I’m the only person on the site with that listed. It’s not even a book. It’s a world map from 1532.
Why did I add it? Jun 1, 2016
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Stitching in time.
Oh, that has to be it.
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