
1) Book decoration 2) Book lead 3) Book part 4) Book sheets 5) Part of it forms the flyleaf
Found on
https://www.crosswordclues.com/clue/endpaper

The endpapers or end-papers of a book are the pages that consist of a double-size sheet folded, with one half pasted against an inside cover, and the other serving as the first free page. Thus, the front endpapers precede the title page and the text, whereas the back endpapers follow the text. Booksellers sometimes refer to the front end paper as ...
Found on
http://en.wikipedia.org/wiki/Endpaper

The paper lining to the inside binding. The Paste Down is pasted to the cover, the Free Endpaper protects the text.
Found on
http://www.encyclo.co.uk/local/20208

The folded sheet of paper pasted to the inside of the front or back cover and attached to the edge of the first or last page of a hardcover book during manufacturing. Endpapers are not normally numbered.
Found on
http://www.trussel.com/books/glossary.htm
No exact match found.