public bookcase
cabinet which may be freely and anonymously used for the exchange and storage of books without the formalities associated with libraries
en-US/ˈpʌblɪk ˈbʊkˌkeɪs/
en-GB/ˈpʌblɪk ˈbʊkkeɪs/
cabinet which may be freely and anonymously used for the exchange and storage of books without the formalities associated with libraries