My Seattle neighborhood has over 30 Little Free Library (https://littlefreelibrary.org/ https://littlefreelibrary.org/) book exchanges. The owners tell me that

My Seattle neighborhood has over 30 Little Free Library (https://littlefreelibrary.org/ https://littlefreelibrary.org/) book exchanges. The owners tell me that they simply seed the exchanges with an initial collection of books and do little in the way of curation or maintenance after that.