Yes, Books Were Bound in Human Skin. An Intrepid Librarian Finds the Proof.

“Dark Archives,” by Megan Rosenbloom, a librarian at U.C.L.A., traces the history of the controversial practice and considers what we should do with such books today.
Read more: https://www.nytimes.com/2020/10/20/books/review/dark-archives-megan-rosenbloom.html?source=Snapzu