United States. Army. Engineer Reproduction Plant, United States. Army. Army, and France. Armée. Groupe de canevas de tir. Carte générale des objectifs d'artillerie a la date du 24 Août 1918 = General map for artillery objectives up to the of 24th August 1918. Washington, D.C.: Engineer Reproduction Plant ; issued by the Military Engineer, 1924. Web. 27 Jul 2025. <https://ark-dc3dev.bpl.org/ark:/50959/9g54xj476>.

United States. Army. Engineer Reproduction Plant, United States. Army. Army, & France. Armée. Groupe de canevas de tir. (1924). Carte générale des objectifs d'artillerie a la date du 24 Août 1918 = General map for artillery objectives up to the of 24th August 1918 [Map]. Retrieved from https://ark-dc3dev.bpl.org/ark:/50959/9g54xj476

United States. Army. Engineer Reproduction Plant, United States. Army. Army, and France. Armée. Groupe de canevas de tir. "Carte générale des objectifs d'artillerie a la date du 24 Août 1918 = General map for artillery objectives up to the of 24th August 1918." Map. Washington, D.C.: Engineer Reproduction Plant ; issued by the Military Engineer, 1924. Digital Commonwealth, https://ark-dc3dev.bpl.org/ark:/50959/9g54xj476 (accessed July 27, 2025).