Smallest book ever....

Well, it has yet to be confirmed, but the Telegraph have reported about this book....

Created in Japan, it is claimed to be the smallest ever printed book.  The pages measure 0.75mm (0.03") and is impossible to read with the naked eye!  

The book, Shiki no Kusabana (flowers of seasons) has tiny illustrations of Japanese flowers, such as cherry and plum.  The letters are just 0.01mm wide.

So, in keeping with this...what is the shortest book you have ever read???  Ooooo that's a hard question!