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Associated Press
In this Thursday, Aug. 27, 2015 photo, exhibit installer Pablo Gonzalez moves a ladder as he adjust the lighting for viewing London Stereoscopic Company portraits, made by unknown photographers in studios across Britain in 19th and early 20th century, in the show "Black Chronicles II" at the Ethelbert Cooper Gallery of African & African American Art in Cambridge, Mass. The show runs from Wednesday, Sept. 2 through Friday Dec. 11, 2015. (AP Photo/Stephan Savoia)

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