_New York._ Included New York City, Long Island, and nine other New York and twelve New Jersey counties. The prime producer of trench-warfare ordnance. Produced much toluol and was a finisher of shell, fuses, and cartridge cases. Loaded more than one-third of all artillery ammunition shipped abroad. Chief, Mr. George J. Roberts, vice-president of the Public Service Corporation of New Jersey. _Philadelphia._ Included eastern Pennsylvania, part of New Jersey, and all of Delaware. The chief service-rifle producer and a chief producer of high explosives. Immense shell-loading activities. Chief, Mr. John C. Jones, president of the Harrison Safety Boiler Works. _Baltimore._ Included all of Maryland but two western counties, and all of the District of Columbia and the states of Virginia and North and South Carolina. The leading shrapnel-loading district and a great shell-loading area. Contained the largest of the ammonium nitrate plants. Produced all the 37-millimeter guns. Chief, Lieutenant Colonel A. V. Barnes, formerly president of the American Book Company. _Rochester._ Embraced all the state of New York not in the New York City district. Chief production was in Lewis machine guns, Enfield rifles, 75-millimeter field guns, shrapnel, picric acid, and optical glass. Chief, Mr. Frank S. Noble, executive officer of the Eastman Kodak Company. _Cleveland._ Northern Ohio and three northwestern counties of Pennsylvania. Produced completed big guns, shell fuses, 75-millimeter gun carriages, mounts for railway artillery, and 6-ton tanks. Chief, Mr. Samuel Scovil, former president of the Cleveland Electric Illuminating Company. _Detroit._ Included the state of Michigan. Produced gun recoil recuperators, artillery vehicles, large-caliber shell, and trench-mortar shell. Chief, Mr. Fred J. Robinson, president of the Lowery-Robinson Lumber Company. _Chicago._ Included northern Illinois and the band of states to the northwest as far as Montana. Produced caterpillar traction for the tanks and artillery, guns, carriages, recuperators, projectiles, and grenades; the district was also saturated with contracts for machinery for the eastern munitions plants. Chief, Mr. E. A. Russell, vice-president of the Otis Elevator Company. _Pittsburg._ Included western Pennsylvania except three counties, two counties of western Maryland, two counties of Ohio, and all of West Virginia. The prime subcontract district for the production of raw steel and steel forgings. Herein was located the Neville Island ordnance plant project. Produced optical glass in quantity. Chief, Mr. Ralph M. Dravo, of Dravo Brothers, contractors, Pittsburg.