fortification

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The term fortification occurs in indexes or keywords of following Zvon materials:

Keywords: Treaty of Westphalia (1648) : fortification [Keywords]
Peace Treaty between the Holy Roman Emperor and the King of France and their respective Allies.
Agreement Governing the Activities of States on the Moon and Other Celestial Bodies (1979) : fortification [Keywords]
moon and other celestial bodies within the solar system, other than the earth; include orbits around or other trajectories to or around them; does not apply to extraterrestrial materials which reach the surface of the earth by natural means
Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies (1967) : fortification [Keywords]
the moon and other celestial bodies, shall be free for exploration and use by all States without discrimination of any kind

Zvon keyword: fortification