From an interview with a salvage operator:
Donald tells the story of one of his jobs when he emptied an attic of books. Cartons of them.
“I had thousands I’ll bet,” he recalls. “Mostly hardcover. Now hardcover books can’t be recycled like other papers. So what I did, I tore the covers off each book and recycled the coverless books as paper. The covers were cardboard.”
Let us all now cringe together…