I hadn't previously thought about dropping books off at other people's LFLs. (There are half a dozen that I pass regularly on my bike rides, in addition to my own.) My original idea when installing a LFL was to use it to deaccession books, but they don't go out fast enough for that. Maybe I should keep a box of books next to my bike in the garage and toss a couple in the saddle bags when I know I'm going to be passing an opportunity.