We have this in The Netherlands in a lot of cities, where people have made wooden boxes, phone boots, and other places outside, filled with 2nd-hand books. You

We have this in The Netherlands in a lot of cities, where people have made wooden boxes, phone boots, and other places outside, filled with 2nd-hand books. You can freely take them, but the unwritten rule is you put another book back in return. There are sites where you can become member, and see locations on a map: https://minibieb.nl/minibieb/buiten-boekenkast/ https://minibieb.nl/minibieb/buiten-boekenkast/