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  2. QF 4.5-inch howitzer - Wikipedia

    en.wikipedia.org/wiki/QF_4.5-inch_howitzer

    The Ordnance QF 4.5-inch howitzer was the standard British Empire field (or ‘light’) howitzer of the First World War era. It replaced the BL 5-inch howitzer and equipped some 25% of the field artillery.

  3. Volume and extent of the Deepwater Horizon oil spill - Wikipedia

    en.wikipedia.org/wiki/Volume_and_extent_of_the...

    The Deepwater Horizon oil spill was discovered on the afternoon of 22 April 2010 when a large oil slick began to spread at the former rig site. According to the Flow Rate Technical Group, the leak amounted to about 4.9 million barrels (210 million US gal; 780,000 m 3) of oil, exceeding the 1989 Exxon Valdez oil spill as the largest ever to originate in U.S.-controlled waters and the 1979 Ixtoc ...