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From the description:

Bexx Caswell-Olson is the director of book conservation at the Northeast Document Conservation Center. She shows us how she restores a 170-year-old marriage record book. This includes deconstructing the book, washing the pages, mending any tears, and reassembling the book. The book has not been copied or digitized, so it is important to conserve it since it is the only record of this information.