Bond, A. Russell (Alexander Russell), 1876- · New York, The Century co. · leaf 29
(C) Underwood & Underwood Lines of Zig-Zag Trenches as viewed from an Airplane … Courtesy of Scientific American French Sappers using Stethoscopes to detect theMining Operations of the Enemy WAR IN AND UNDER THE GROUND 9 to drive the invaders out of the country. Theconstruction of the trenches along some partsof the battle-line was particularly difficult, bercause of the…
Inventions
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