Longitudinal section and left elevation of <a href="https://en.wikipedia.org/wiki/Canon_de_155_mm_GPF" class="extiw" title="en:Canon de 155 mm GPF">155 mm GPF gun</a>, US Army service.
US Ordnance Department
1921-07
<p>"Handbook of Artillery". US Ordnance Department. Document No. 2033. Page 252
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