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51tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
52Blitzkrieg — (German for lightning war Audio|De blitzkrieg.ogg|listen) is a popular name for an offensive operational level military doctrine which involves an initial bombardment followed by the employment of motorized mobile forces attacking with speed and… …
53Propeller — A propeller is essentially a type of fan which transmits power by converting rotational motion into thrust for propulsion of a vehicle such as an aircraft, ship, or submarine through a mass such as water or air, by rotating two or more twisted… …
54Mars — /mahrz/, n. 1. the ancient Roman god of war and agriculture, identified with the Greek god Ares. 2. Astron. the planet fourth in order from the sun, having a diameter of 4222 miles (6794 km), a mean distance from the sun of 141.6 million miles… …
55Operation Undertone — Part of the Western Front of World War II …
56celestial mechanics — the branch of astronomy that deals with the application of the laws of dynamics and Newton s law of gravitation to the motions of heavenly bodies. [1815 25] * * * Branch of astronomy that deals with the mathematical theory of the motions of… …
57Taku Glacier — Infobox Glacier | glacier name = Taku Glacier caption = Taku Glacier type = Tidewater glacier location = City and Borough of Juneau, Alaska, USA coordinates = coord|58|26|57|N|134|04|42|W|type:glacier area = 261 square miles (428 square… …
58XX Corps (United States) — Infobox Military Unit unit name=XX Corps caption=XX Corps shoulder sleeve insignia dates=10 Oct 1943 1 Mar 1946 20 Sep 1957 5 Jun 1970 country=United States allegiance= branch=AUS in World War II Regular Army postwar type=Army Corps role= size=… …
59Uman–Botoshany Offensive — Campaign raw name = Winter Spring Campaign of 1944 name = Winter Spring Campaign of 1944 battles = Dnepr Carpathian Strategic Offensive Kalinkovichi Mozyr Offensive Leningrad Novgorod Strategic Offensive Rogachev Zhlobin Offensive Crimean… …
60Operation Bluecoat — Part of Operation Overlord, Battle of Normandy Date 30 July – 7 August 1944 Location Normandy, France Result …
