Major J. Maitland-Addison (July–September 1918). "The Long Range Guns"(PDF). The Field Artillery Journal (3). Archived from the original(PDF) on 17 June 2011.
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Major J. Maitland-Addison (July–September 1918). "The Long Range Guns"(PDF). The Field Artillery Journal (3). Archived from the original(PDF) on 17 June 2011.