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The Northwest Current (December 12, 2007: pg. 1)
Operating under tight safety restrictions, the U.S. Army Corps of Engineers yesterday began excavating what it calls the "last known burial pit" of World War I chemical munitions in Northwest Washington's Spring Valley neighborhood. The Army expects to excavate at least fifteen 75mm artillery rounds -- a dozen or more with mustard gas and three with arsine, both toxic chemical agents -- buried in the affluent residential neighborhood that was once a site for developing and testing chemical weapons ... Washington Post (October 30, 2007: pg. B-1)