September 11 2001 Terror Attack on World Trade Center
Photographs © Allan Tannenbaum
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U.S. Environmental Protection Agency workers don protective gear
U.S. Environmental Protection Agency workers don protective gear at 110 Liberty St. to test cleaning methods as part of the E.P.A.'s indoor clean air initiative for Lower Manhattan. Some have walkie-talkies and others are bringing air quality monitors into the building. NYC 27 June 2002