Some of the signs, letters, stuffed animals, and array of hats and shoes that once took over Copley Square following the Boston Marathon attack on April 15, will be on display during an exhibit to honor the victims on the six month anniversary of the bombing, and will supplement a digital archive put together by Northeastern University researchers.

“Our Marathon,” a crowd-sourced, digital archive of the Boston Marathon bombings, opens on October 15, at Northeastern University’s Snell Library, and will feature items placed at the scene of the horrific attack, which were later catalogued and placed in the City of Boston Archives. The exhibit is an extension of a digital project launched by the school’s NULab for Texts, Maps, and Networks, a new center for Digital Humanities and Computational Social Science, which has dedicated time to compiling thousands of digital memories stemming from the April 15 tragedy.

While the display is a one-day event, the group has been collecting information for the project since May, which is available online. It has since become the largest collection of digital references of its kind.