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In this March 13, 2017, photo, Seth Irwin, a paper conservator from Boston, shows cellophane tape he removed from historical maps, while working on Sesquicentennial documents that will go on display later this year at the State Library, Archives and Museum in Juneau, Alaska. (Michael Penn /The Juneau Empire via AP)

In this March 13, 2017, photo, Seth Irwin, a paper conservator from Boston, shows cellophane tape he removed from historical maps, while working on Sesquicentennial documents that will go on display later this year at the State Library, Archives and Museum in Juneau, Alaska. (Michael Penn /The Juneau Empire via AP)

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