United States. Army Division of Military Aeronautics · leaf 392
PLATE XLIX. — Positions of high-powered heavy artillery (2). … 1. Emplacement of high-powered heavy artillery in woods. —Clearing camouflaged.— Railways are hardly visible. 2. A. Same emplacement as on photo 1, after demolition fire. — Railways have become very visible. 3. A. 380 mm. gun on platform. — B, B'. Concrete shelters.— C. Emplacement constructed…
Balloons · Aeronautics, Military
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
![An illustration from [Balloon notes], 1917, leaf 392](https://img.insideoutlibrary.com/img/1024/ia-balloonnotes02unit-392-0.webp)
