When selecting the next book to read I came across the below jewellery making instructions in my secondhand copy of "The Gift" by Lewis Hyde. If the previous owner was using it as a bookmark they obviously didn't get very far as it was inserted near the front of the book. Perhaps that's why they got rid of it. Still, I wonder if, and for how long, they were hunting for those instructions after parting with the book.
I occasionally come across the odd note or dedication written in secondhand books which gives them a great sense of history. My copy of Unplugged by Nicholas Bate was an ex-library book which, with my purchase, has returned to the county it used to call home according to the library stamps.