Most of you have the "Orange Book", the 読書記録手帳. The back of the book has a list of books, organized by series and level, with details of the difficulty and number of words. When you note the books you are reading, you should write two figures in the words column, the number of words of the present book and your total number of words so far.
The Orange Book doesn't have details on all books. A book with lots more data is the 英語多読完全ブックガイド. The PUK Library has three copies of this book. How about the KGU Library?