Question

how do book become a source for studying history ​

Answer 1

Answer:

people write down they presence and good works, some amazing, unique things in books for future references and more.

so that books and there further copies can be a source of studying history.

Answer 2

Answer:

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they become a source of knowledge. books that were written a long time ago give detailed information about the life and Society of ancient times they inform us about the religion and culture of that period