 The first printed periodical, the Kaiyuan Za Bao was made available in AD 713.However, the earliest known book printed at regular size is the "Diamond Sutra" made during the Tang Dynasty (618–907), a 5.18 m (17 ft) long scroll which bears the date 868 AD.Joseph Needham and Tsien Tsuen-hsuin write that the cutting and printing techniques used for the delicate calligraphy of the "Diamond Sutra" book are much more advanced and refined than the miniature "Dharani" sutra printed earlier.