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The earliest known books are the clay tablets of Mesopotamia and the papyrus rolls of Egypt. https://www.britannica.com/topic/publishing/Book-publishing -
Christian era, literary and archaeological evidence indicates that the Chinese had writing and probably books at least as early as 1300 bce. Those primitive books were made of wood or bamboo strips bound together with cords. -
It has been suggested that papyrus was continuously in use in Greece from the 6th century bce, and evidence has been cited to indicate its use as early as 900 bce.