As a record of human civilization, the price of paper has remained high.

The "papyrus" of the Sinai Peninsula (mainly Egypt) was once the main paper on the European continent and in West Asia.

However, due to war, inconvenient transportation and other factors, the "leather paper" technology has risen, and animal skins such as cattle, sheep and rabbits are used as writing paper.

In the Dark Ages, a theological book full of sacred texts required the skins of 300 to 400 sheep.

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