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Stokes mortar - Wikipedia
Everything You Need to Know About WWI Mortars
List of heavy mortars - Wikipedia
List of infantry mortars - Wikipedia
Mortar | History, Types & Uses | Britannica
First World War.com - Weapons of War: Trench Mortars
Artillery - National WWI Museum and Memorial
Bruce N. Canfield: The Three Inch Stokes Mortar
Stokes mortar | weaponry | Britannica
The Role of Mortar in World War I: Innovations and Impact