Our school has been blessed with having multiple copies of lots of different books. We house them all in our Literacy Library.
Years ago, we made a decision to do away with reading workbooks and we were allowed to spend some of that money on ordering books.
We bought matching bookshelves and lined the walls with them. Each set of books is kept in cardboard magazine boxes. My paraprofessional typed up book labels for each box. On the side of each box is a library pocket and card. Teachers just sign the card when they want to borrow the books from that box.
The books are organized by approximate grade level. By having access to the Lit. Library, teachers can have so many choices of reading materials for their students. It helps to have a range of levels to choose from so that we can better match up the right books to our students for those years that you may have students far behind or far ahead of grade level.
We keep track of all our books in a notebook. The books are listed in alphabetical order with the book level also listed.
Does your school have anything like this or does each teacher keep all their books in their own classroom? I would love to hear how your books are organized!