From a consulting client:
I was contacted by a book club that told me their library has “book kits” for book clubs, in which they have a bag that contains 10 books, reading guide questions and anything else pertinent to the book, and that their library is using my book for one of the book kits.
I promptly sent a hand-written thank you card to the head librarian. Today, I got an email asking me if I’d like to do a reading/signing at the library. They would publicize it in their newsletter that goes out to 6000 homes, as well as on their website. Never would have happened if I hadn’t sent the thank-you.