United States. Ordnance Dept. Service handbook of the 6-inch trench mortar, Mark I / prepared in the Office of the Chief of Ordnance, July, 1921.

United States. Ordnance Dept.

Service handbook of the 6-inch trench mortar, Mark I / prepared in the Office of the Chief of Ordnance, July, 1921.

Washington : Govt. Print. Off., 1921.

Cover title.

Mortars (Ordnance) -- United States.

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