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A paper conservator demonstrates book conservation techniques for three engaged guests with various tools and instruments at a rare book exhibit at John Hopkins University's George Peabody Library, Baltimore, Maryland, 2015. (Photo by JHU Sheridan Libraries/Gado/Getty Images).

A paper conservator demonstrates book conservation techniques for three engaged guests with various tools and instruments at a rare book exhibit at John Hopkins University's George Peabody Library, Baltimore, Maryland, 2015. (Photo by JHU Sheridan Libraries/Gado/Getty Images).