Oldest book in the world

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Discovery and Significance:
The "Diamond Sutra" was discovered in a walled-up cave in China and is a remarkably preserved example of early printing technology.
It holds immense historical, religious, and cultural significance as it is the earliest dated printed book in the world.
The British Library calls it the earliest dated printed book.
Content:
It is a Buddhist holy text, specifically a sutra or discourse.
The book is made up of Chinese characters printed on a scroll of gray-printed paper, wrapped around a wooden pole.