Many television networks will no longer air the most devastating moments of the September 11, 2001 attacks on the World Trade Center, lest it upset the families of the thousands of people who lost their lives that day.

But Understanding 9/11: A Television News Archive feels that that footage is essential as a “resource for scholars, journalists, and the public,” and has archived 3,000 hours of it, along with timelines and scholarly analysis.

The site’s Rick Prelinger describes it as “an online library of 24/7 TV news broadcasts from 20 worldwide channels over the week starting 9/11/2001. [It has] a striking interface that shows 20 channels of each day’s news on a single page, with framegrabs that link to streamable segments.”

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