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Mortar (weapon) - Wikipedia
Mortar (masonry) - Wikipedia
List of infantry mortars - Wikipedia
Mortar | History, Types & Uses | Britannica
Famous Military Weapons: Mortars - Warfare History Network
Mortars (Infantry-Level) - Military Factory
[Weapons 101] How does a Mortar work? - YouTube
Mortar (weapon) - Simple English Wikipedia, the free encyclopedia
Artillery - Mortars, Barrels, Calibers | Britannica
Mortar (weapon) | Encyclopedia.com