...on horseback, in supermarkets, in vending machines, on burros, in Walmart stores, etc.
BookRiot has put together a list of unlikely locations for libraries.
For example, here's the pack horse library in Hindman Kentucky.
During the Great Depression, as part of an effort to boost employment for women, the Works Progress Administration funded the Pack Horse Library Project of Eastern Kentucky, which sent women out on horseback to deliver books to parts of the Cumberland Mountains inaccessible to cars and trucks. You can learn more about the Pack Horse Library and the women who made it possible in Kathi Appelt and Jeanne Cannella Schmitzer’s recently-released Down Cut Shin Creek: The Pack Horse Librarians of Kentucky (HarperCollins).