The thinnest book in Britain is British cookbook, the thinnest book in France is Who's Who in France, the thinnest book in America is American History, the thinnest books in Italy are Italian Heroic Epic and A Record of the Italian Army, the thinnest book in Germany is The Powerful German Navy, and the thinnest book in China is China who won the Nobel Prize.

There are unconfirmed rumors that the smallest book in the world was found in Zhengzhou, Henan, China. Confirmed by Guinness Headquarters in Shanghai World, this holy book of Islam, the Koran, was collected by a retired worker surnamed Bai. It is 25.708 mm long, 9.5 mm wide17 mm thick and 4.3 18 g heavy. ..

It is nearly 5g lighter than 1988' s "the world's smallest rare Koran" found in Algeria. The book was printed about 200 years ago, with 30 volumes, 1 14 chapters. The pages of this book are as thin as cicadas' wings, with gold edges.