Abbreviated EP. The double leaves added to the book by the binder that become the pastedowns and free endpapers inside the front and rear covers. These pages are an integral part of the construction of a book, holding the text block and case together. The lack of them drastically shortens the value and life of a book, and should be considered a defect. The endpaper attached to the board is called fixed while the endpaper that is losse is called free.
Endpapers can be white or any color, or they can be decorated or informative. The illustration shows the map endpapers used for Winnie the Pooh.