Here’s an article about different things found in used books. I have found personal letters and telephone bills in library books, but no money. One time I found a toad in the book drop.
“Be careful about reading health books. You may die of a misprint.” ~ Mark Twain (1835-1910) Author
“If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales.”
The printed word is quickly becoming a thing of the past.