Use/install Calibre to manage your digital book library.
Than add Let’s share books cool plugin which makes your local book library to become a building block of (our) public library.
memoryoftheworld.org is home of this public library project (one of many, explore Internet to find more). There you can find a lot of useful information about books, meaning and importance of public library, download this tools etc…
Read more here: “When everyone is librarian, library is everywhere.”