33.03 measurement and instrumentation in physics 1 33.12 acoustics 1 89.87 weapons, arms and armor 1 Abolitionists 1 Account books 2 Accounting 5 Accounts receivable 1 Administration 1 Admission 1 Aerial operations 2 Aerial operations, American 1 Aerial operations, British 1 Affûts de canon 1 Afterburning 1 Air warfare 1 Air weapons 1 Airplanes, Military 2 American newspapers 1 Americans 3 Ammunition 8 Amor 1 Amputees 1 Anemometer 1 Antietam, Battle of, Md., 1862 1 Appareils et matériel 1 Appointments and retirements 1 Appropriations and expenditures 3 Armada, 1588 1 Armament 1 Armaria (Colecoes Em Museus) 1 Armed Forces 27 Armes 1 Armes à feu 3 Armes chimiques 1 Armes de guerre 1 Armies 1 Armor 6 Armor-plate 3 Armored vehicles, Military 3 Armored vessels 1 Arms transfers 1 Armstrong gun 3 Army of Northern Virginia (C.S.A.) 1 Arsenals 2 Art et science militaires 1 Artilleri 1 Artillerie 6 Artillerie de campagne et de montagne 1 Artillerie de siège 1 Artillerie navale 9 mehr ...